diff --git a/openvpn-install.sh b/openvpn-install.sh
index 939a9d2..d10fd92 100755
--- a/openvpn-install.sh
+++ b/openvpn-install.sh
@@ -3,80 +3,81 @@
 # Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux
 # https://github.com/Angristan/OpenVPN-install
 
+set -ex
 
 if [[ "$EUID" -ne 0 ]]; then
-	echo "Sorry, you need to run this as root"
-	exit 1
+    echo "Sorry, you need to run this as root"
+    exit 1
 fi
 
 if [[ ! -e /dev/net/tun ]]; then
-	echo "TUN is not available"
-	exit 2
+    echo "TUN is not available"
+    exit 2
 fi
 
 if grep -qs "CentOS release 5" "/etc/redhat-release"; then
-	echo "CentOS 5 is too old and not supported"
-	exit 3
+    echo "CentOS 5 is too old and not supported"
+    exit 3
 fi
 
 if [[ -e /etc/debian_version ]]; then
-	OS="debian"
-	# Getting the version number, to verify that a recent version of OpenVPN is available
-	VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
-	IPTABLES='/etc/iptables/iptables.rules'
-	SYSCTL='/etc/sysctl.conf'
-	if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
-		echo "Your version of Debian/Ubuntu is not supported."
-		echo "I can't install a recent version of OpenVPN on your system."
-		echo ""
-		echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
-		echo "then you can continue, a recent version of OpenVPN is available on these."
-		echo "Keep in mind they are not supported, though."
-		while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
-			read -p "Continue ? [y/n]: " -e CONTINUE
-		done
-		if [[ "$CONTINUE" = "n" ]]; then
-			echo "Ok, bye !"
-			exit 4
-		fi
-	fi
+    OS="debian"
+    # Getting the version number, to verify that a recent version of OpenVPN is available
+    VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
+    IPTABLES='/etc/iptables/iptables.rules'
+    SYSCTL='/etc/sysctl.conf'
+    if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
+        echo "Your version of Debian/Ubuntu is not supported."
+        echo "I can't install a recent version of OpenVPN on your system."
+        echo ""
+        echo "However, if you're using Debian unstable/testing, or Ubuntu beta,"
+        echo "then you can continue, a recent version of OpenVPN is available on these."
+        echo "Keep in mind they are not supported, though."
+        while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
+            read -p "Continue ? [y/n]: " -e CONTINUE
+        done
+        if [[ "$CONTINUE" = "n" ]]; then
+            echo "Ok, bye !"
+            exit 4
+        fi
+    fi
 elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
-	OS=centos
-	IPTABLES='/etc/iptables/iptables.rules'
-	SYSCTL='/etc/sysctl.conf'
+    OS=centos
+    IPTABLES='/etc/iptables/iptables.rules'
+    SYSCTL='/etc/sysctl.conf'
 elif [[ -e /etc/arch-release ]]; then
-	OS=arch
-	IPTABLES='/etc/iptables/iptables.rules'
-	SYSCTL='/etc/sysctl.d/openvpn.conf'
+    OS=arch
+    IPTABLES='/etc/iptables/iptables.rules'
+    SYSCTL='/etc/sysctl.d/openvpn.conf'
 else
-	echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
-	exit 4
+    echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
+    exit 4
 fi
 
 newclient () {
-	# Where to write the custom client.ovpn?
-	if [ -e /home/$1 ]; then  # if $1 is a user name
-		homeDir="/home/$1"
-	elif [ ${SUDO_USER} ]; then   # if not, use SUDO_USER
-		homeDir="/home/${SUDO_USER}"
-	else  # if not SUDO_USER, use /root
-		homeDir="/root"
-	fi
-	# Generates the custom client.ovpn
-	cp /etc/openvpn/client-template.txt $homeDir/$1.ovpn
-	echo "<ca>" >> $homeDir/$1.ovpn
-	cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
-	echo "</ca>" >> $homeDir/$1.ovpn
-	echo "<cert>" >> $homeDir/$1.ovpn
-	cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
-	echo "</cert>" >> $homeDir/$1.ovpn
-	echo "<key>" >> $homeDir/$1.ovpn
-	cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
-	echo "</key>" >> $homeDir/$1.ovpn
-	echo "key-direction 1" >> $homeDir/$1.ovpn
-	echo "<tls-auth>" >> $homeDir/$1.ovpn
-	cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
-	echo "</tls-auth>" >> $homeDir/$1.ovpn
+    # Where to write the custom client.ovpn?
+    if [ -e /home/$1 ]; then  # if $1 is a user name
+        homeDir="/home/$1"
+    elif [ ${SUDO_USER} ]; then   # if not, use SUDO_USER
+        homeDir="/home/${SUDO_USER}"
+    else  # if not SUDO_USER, use /root
+        homeDir="/root"
+    fi
+    # Generates the custom client.ovpn
+    cp /etc/openvpn/client-template.txt $homeDir/$1.ovpn
+    echo "<ca>" >> $homeDir/$1.ovpn
+    cat /etc/openvpn/easy-rsa/pki/ca.crt >> $homeDir/$1.ovpn
+    echo "</ca>" >> $homeDir/$1.ovpn
+    echo "<cert>" >> $homeDir/$1.ovpn
+    cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> $homeDir/$1.ovpn
+    echo "</cert>" >> $homeDir/$1.ovpn
+    echo "<key>" >> $homeDir/$1.ovpn
+    cat /etc/openvpn/easy-rsa/pki/private/$1.key >> $homeDir/$1.ovpn
+    echo "</key>" >> $homeDir/$1.ovpn
+    echo "key-direction 1" >> $homeDir/$1.ovpn
+    echo "<tls-auth>" >> $homeDir/$1.ovpn
+    cat /etc/openvpn/tls-auth.key >> $homeDir/$1.ovpn
+    echo "</tls-auth>" >> $homeDir/$1.ovpn
 }
 
 # Try to get our IP from the system and fallback to the Internet.
@@ -84,278 +85,278 @@ newclient () {
 # and to avoid getting an IPv6.
 IP=$(ip addr | grep 'inet' | grep -v inet6 | grep -vE '127\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -o -E '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | head -1)
 if [[ "$IP" = "" ]]; then
-	IP=$(wget -qO- ipv4.icanhazip.com)
+    IP=$(wget -qO- ipv4.icanhazip.com)
 fi
 # Get Internet network interface with default route
 NIC=$(ip -4 route ls | grep default | grep -Po '(?<=dev )(\S+)' | head -1)
 
 if [[ -e /etc/openvpn/server.conf ]]; then
-	while :
-	do
-	clear
-		echo "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
-		echo ""
-		echo "Looks like OpenVPN is already installed"
-		echo ""
-		echo "What do you want to do?"
-		echo "   1) Add a cert for a new user"
-		echo "   2) Revoke existing user cert"
-		echo "   3) Remove OpenVPN"
-		echo "   4) Exit"
-		read -p "Select an option [1-4]: " option
-		case $option in
-			1)
-			echo ""
-			echo "Tell me a name for the client cert"
-			echo "Please, use one word only, no special characters"
-			read -p "Client name: " -e -i client CLIENT
-			cd /etc/openvpn/easy-rsa/
-			./easyrsa build-client-full $CLIENT nopass
-			# Generates the custom client.ovpn
-			newclient "$CLIENT"
-			echo ""
-			echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
-			exit
-			;;
-			2)
-			NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
-			if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
-				echo ""
-				echo "You have no existing clients!"
-				exit 5
-			fi
-			echo ""
-			echo "Select the existing client certificate you want to revoke"
-			tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
-			if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
-				read -p "Select one client [1]: " CLIENTNUMBER
-			else
-				read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
-			fi
-			CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
-			cd /etc/openvpn/easy-rsa/
-			./easyrsa --batch revoke $CLIENT
-			EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
-			rm -rf pki/reqs/$CLIENT.req
-			rm -rf pki/private/$CLIENT.key
-			rm -rf pki/issued/$CLIENT.crt
-			rm -rf /etc/openvpn/crl.pem
-			cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
-			chmod 644 /etc/openvpn/crl.pem
-			echo ""
-			echo "Certificate for client $CLIENT revoked"
-			echo "Exiting..."
-			exit
-			;;
-			3)
-			echo ""
-			read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
-			if [[ "$REMOVE" = 'y' ]]; then
-				PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
-				if pgrep firewalld; then
-					# Using both permanent and not permanent rules to avoid a firewalld reload.
-					firewall-cmd --zone=public --remove-port=$PORT/udp
-					firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
-					firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
-					firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
-				fi
-				if iptables -L -n | grep -qE 'REJECT|DROP'; then
-					if [[ "$PROTOCOL" = 'udp' ]]; then
-						iptables -D INPUT -p udp --dport $PORT -j ACCEPT
-					else
-						iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
-					fi
-					iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
-					iptables-save > $IPTABLES
-				fi
-				iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
-				iptables-save > $IPTABLES
-				if hash sestatus 2>/dev/null; then
-					if sestatus | grep "Current mode" | grep -qs "enforcing"; then
-						if [[ "$PORT" != '1194' ]]; then
-							semanage port -d -t openvpn_port_t -p udp $PORT
-						fi
-					fi
-				fi
-				if [[ "$OS" = 'debian' ]]; then
-					apt-get autoremove --purge -y openvpn
-				elif [[ "$OS" = 'arch' ]]; then
-					pacman -R openvpn --noconfirm
-				else
-					yum remove openvpn -y
-				fi
-				rm -rf /etc/openvpn
-				rm -rf /usr/share/doc/openvpn*
-				echo ""
-				echo "OpenVPN removed!"
-			else
-				echo ""
-				echo "Removal aborted!"
-			fi
-			exit
-			;;
-			4) exit;;
-		esac
-	done
+    while :
+    do
+        clear
+        echo "OpenVPN-install (github.com/Angristan/OpenVPN-install)"
+        echo ""
+        echo "Looks like OpenVPN is already installed"
+        echo ""
+        echo "What do you want to do?"
+        echo "   1) Add a cert for a new user"
+        echo "   2) Revoke existing user cert"
+        echo "   3) Remove OpenVPN"
+        echo "   4) Exit"
+        read -p "Select an option [1-4]: " option
+        case $option in
+            1)
+                echo ""
+                echo "Tell me a name for the client cert"
+                echo "Please, use one word only, no special characters"
+                read -p "Client name: " -e -i client CLIENT
+                cd /etc/openvpn/easy-rsa/
+                ./easyrsa build-client-full $CLIENT nopass
+                # Generates the custom client.ovpn
+                newclient "$CLIENT"
+                echo ""
+                echo "Client $CLIENT added, certs available at $homeDir/$CLIENT.ovpn"
+                exit
+                ;;
+            2)
+                NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
+                if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
+                    echo ""
+                    echo "You have no existing clients!"
+                    exit 5
+                fi
+                echo ""
+                echo "Select the existing client certificate you want to revoke"
+                tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
+                if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
+                    read -p "Select one client [1]: " CLIENTNUMBER
+                else
+                    read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
+                fi
+                CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
+                cd /etc/openvpn/easy-rsa/
+                ./easyrsa --batch revoke $CLIENT
+                EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+                rm -rf pki/reqs/$CLIENT.req
+                rm -rf pki/private/$CLIENT.key
+                rm -rf pki/issued/$CLIENT.crt
+                rm -rf /etc/openvpn/crl.pem
+                cp /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn/crl.pem
+                chmod 644 /etc/openvpn/crl.pem
+                echo ""
+                echo "Certificate for client $CLIENT revoked"
+                echo "Exiting..."
+                exit
+                ;;
+            3)
+                echo ""
+                read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
+                if [[ "$REMOVE" = 'y' ]]; then
+                    PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
+                    if pgrep firewalld; then
+                        # Using both permanent and not permanent rules to avoid a firewalld reload.
+                        firewall-cmd --zone=public --remove-port=$PORT/udp
+                        firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
+                        firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
+                        firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
+                    fi
+                    if iptables -L -n | grep -qE 'REJECT|DROP'; then
+                        if [[ "$PROTOCOL" = 'udp' ]]; then
+                            iptables -D INPUT -p udp --dport $PORT -j ACCEPT
+                        else
+                            iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
+                        fi
+                        iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
+                        iptables-save > $IPTABLES
+                    fi
+                    iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
+                    iptables-save > $IPTABLES
+                    if hash sestatus 2>/dev/null; then
+                        if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+                            if [[ "$PORT" != '1194' ]]; then
+                                semanage port -d -t openvpn_port_t -p udp $PORT
+                            fi
+                        fi
+                    fi
+                    if [[ "$OS" = 'debian' ]]; then
+                        apt-get autoremove --purge -y openvpn
+                    elif [[ "$OS" = 'arch' ]]; then
+                        pacman -R openvpn --noconfirm
+                    else
+                        yum remove openvpn -y
+                    fi
+                    rm -rf /etc/openvpn
+                    rm -rf /usr/share/doc/openvpn*
+                    echo ""
+                    echo "OpenVPN removed!"
+                else
+                    echo ""
+                    echo "Removal aborted!"
+                fi
+                exit
+                ;;
+            4) exit ;;
+        esac
+    done
 else
-	clear
-	echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
-	echo ""
-	# OpenVPN setup and first user creation
-	echo "I need to ask you a few questions before starting the setup"
-	echo "You can leave the default options and just press enter if you are ok with them"
-	echo ""
-	echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
-	echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
-	echo "Otherwise, it should be your public IPv4 address."
-	read -p "IP address: " -e -i $IP IP
-	echo ""
-	echo "What port do you want for OpenVPN?"
-	read -p "Port: " -e -i 1194 PORT
-	echo ""
-	echo "What protocol do you want for OpenVPN?"
-	echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
-	while [[ $PROTOCOL != "UDP" && $PROTOCOL != "TCP" ]]; do
-		read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
-	done
-	echo ""
-	echo "What DNS do you want to use with the VPN?"
-	echo "   1) Current system resolvers (from /etc/resolv.conf)"
-	echo "   2) Quad9 (Anycast: worldwide)"
-	echo "   3) FDN (France)"
-	echo "   4) DNS.WATCH (Germany)"
-	echo "   5) OpenDNS (Anycast: worldwide)"
-	echo "   6) Google (Anycast: worldwide)"
-	echo "   7) Yandex Basic (Russia)"
-	echo "   8) AdGuard DNS (Russia)"
-	while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" && $DNS != "7" && $DNS != "8" ]]; do
-		read -p "DNS [1-8]: " -e -i 1 DNS
-	done
-	echo ""
-	echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
-	echo "the encryption in OpenVPN and the choices I made in this script."
-	echo "Please note that all the choices proposed are secure (to a different degree)"
-	echo "and are still viable to date, unlike some default OpenVPN options"
-	echo ''
-	echo "Choose which cipher you want to use for the data channel:"
-	echo "   1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
-	echo "   2) AES-192-CBC"
-	echo "   3) AES-256-CBC"
-	echo "Alternatives to AES, use them only if you know what you're doing."
-	echo "They are relatively slower but as secure as AES."
-	echo "   4) CAMELLIA-128-CBC"
-	echo "   5) CAMELLIA-192-CBC"
-	echo "   6) CAMELLIA-256-CBC"
-	echo "   7) SEED-CBC"
-	while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" && $CIPHER != "7" ]]; do
-		read -p "Cipher [1-7]: " -e -i 1 CIPHER
-	done
-	case $CIPHER in
-		1)
-		CIPHER="cipher AES-128-CBC"
-		;;
-		2)
-		CIPHER="cipher AES-192-CBC"
-		;;
-		3)
-		CIPHER="cipher AES-256-CBC"
-		;;
-		4)
-		CIPHER="cipher CAMELLIA-128-CBC"
-		;;
-		5)
-		CIPHER="cipher CAMELLIA-192-CBC"
-		;;
-		6)
-		CIPHER="cipher CAMELLIA-256-CBC"
-		;;
-		7)
-		CIPHER="cipher SEED-CBC"
-		;;
-	esac
-	echo ""
-	echo "Choose what size of Diffie-Hellman key you want to use:"
-	echo "   1) 2048 bits (fastest)"
-	echo "   2) 3072 bits (recommended, best compromise)"
-	echo "   3) 4096 bits (most secure)"
-	while [[ $DH_KEY_SIZE != "1" && $DH_KEY_SIZE != "2" && $DH_KEY_SIZE != "3" ]]; do
-		read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
-	done
-	case $DH_KEY_SIZE in
-		1)
-		DH_KEY_SIZE="2048"
-		;;
-		2)
-		DH_KEY_SIZE="3072"
-		;;
-		3)
-		DH_KEY_SIZE="4096"
-		;;
-	esac
-	echo ""
-	echo "Choose what size of RSA key you want to use:"
-	echo "   1) 2048 bits (fastest)"
-	echo "   2) 3072 bits (recommended, best compromise)"
-	echo "   3) 4096 bits (most secure)"
-	while [[ $RSA_KEY_SIZE != "1" && $RSA_KEY_SIZE != "2" && $RSA_KEY_SIZE != "3" ]]; do
-		read -p "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
-	done
-	case $RSA_KEY_SIZE in
-		1)
-		RSA_KEY_SIZE="2048"
-		;;
-		2)
-		RSA_KEY_SIZE="3072"
-		;;
-		3)
-		RSA_KEY_SIZE="4096"
-		;;
-	esac
-	echo ""
-	echo "Finally, tell me a name for the client certificate and configuration"
-	while [[ $CLIENT = "" ]]; do
-		echo "Please, use one word only, no special characters"
-		read -p "Client name: " -e -i client CLIENT
-	done
-	echo ""
-	echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
-	read -n1 -r -p "Press any key to continue..."
+    clear
+    echo "Welcome to the secure OpenVPN installer (github.com/Angristan/OpenVPN-install)"
+    echo ""
+    # OpenVPN setup and first user creation
+    echo "I need to ask you a few questions before starting the setup"
+    echo "You can leave the default options and just press enter if you are ok with them"
+    echo ""
+    echo "I need to know the IPv4 address of the network interface you want OpenVPN listening to."
+    echo "If your server is running behind a NAT, (e.g. LowEndSpirit, Scaleway) leave the IP address as it is. (local/private IP)"
+    echo "Otherwise, it should be your public IPv4 address."
+    read -p "IP address: " -e -i $IP IP
+    echo ""
+    echo "What port do you want for OpenVPN?"
+    read -p "Port: " -e -i 1194 PORT
+    echo ""
+    echo "What protocol do you want for OpenVPN?"
+    echo "Unless UDP is blocked, you should not use TCP (unnecessarily slower)"
+    while [[ $PROTOCOL != "UDP" && $PROTOCOL != "TCP" ]]; do
+        read -p "Protocol [UDP/TCP]: " -e -i UDP PROTOCOL
+    done
+    echo ""
+    echo "What DNS do you want to use with the VPN?"
+    echo "   1) Current system resolvers (from /etc/resolv.conf)"
+    echo "   2) Quad9 (Anycast: worldwide)"
+    echo "   3) FDN (France)"
+    echo "   4) DNS.WATCH (Germany)"
+    echo "   5) OpenDNS (Anycast: worldwide)"
+    echo "   6) Google (Anycast: worldwide)"
+    echo "   7) Yandex Basic (Russia)"
+    echo "   8) AdGuard DNS (Russia)"
+    while [[ $DNS != "1" && $DNS != "2" && $DNS != "3" && $DNS != "4" && $DNS != "5" && $DNS != "6" && $DNS != "7" && $DNS != "8" ]]; do
+        read -p "DNS [1-8]: " -e -i 1 DNS
+    done
+    echo ""
+    echo "See https://github.com/Angristan/OpenVPN-install#encryption to learn more about "
+    echo "the encryption in OpenVPN and the choices I made in this script."
+    echo "Please note that all the choices proposed are secure (to a different degree)"
+    echo "and are still viable to date, unlike some default OpenVPN options"
+    echo ''
+    echo "Choose which cipher you want to use for the data channel:"
+    echo "   1) AES-128-CBC (fastest and sufficiently secure for everyone, recommended)"
+    echo "   2) AES-192-CBC"
+    echo "   3) AES-256-CBC"
+    echo "Alternatives to AES, use them only if you know what you're doing."
+    echo "They are relatively slower but as secure as AES."
+    echo "   4) CAMELLIA-128-CBC"
+    echo "   5) CAMELLIA-192-CBC"
+    echo "   6) CAMELLIA-256-CBC"
+    echo "   7) SEED-CBC"
+    while [[ $CIPHER != "1" && $CIPHER != "2" && $CIPHER != "3" && $CIPHER != "4" && $CIPHER != "5" && $CIPHER != "6" && $CIPHER != "7" ]]; do
+        read -p "Cipher [1-7]: " -e -i 1 CIPHER
+    done
+    case $CIPHER in
+        1)
+            CIPHER="cipher AES-128-CBC"
+            ;;
+        2)
+            CIPHER="cipher AES-192-CBC"
+            ;;
+        3)
+            CIPHER="cipher AES-256-CBC"
+            ;;
+        4)
+            CIPHER="cipher CAMELLIA-128-CBC"
+            ;;
+        5)
+            CIPHER="cipher CAMELLIA-192-CBC"
+            ;;
+        6)
+            CIPHER="cipher CAMELLIA-256-CBC"
+            ;;
+        7)
+            CIPHER="cipher SEED-CBC"
+            ;;
+    esac
+    echo ""
+    echo "Choose what size of Diffie-Hellman key you want to use:"
+    echo "   1) 2048 bits (fastest)"
+    echo "   2) 3072 bits (recommended, best compromise)"
+    echo "   3) 4096 bits (most secure)"
+    while [[ $DH_KEY_SIZE != "1" && $DH_KEY_SIZE != "2" && $DH_KEY_SIZE != "3" ]]; do
+        read -p "DH key size [1-3]: " -e -i 2 DH_KEY_SIZE
+    done
+    case $DH_KEY_SIZE in
+        1)
+            DH_KEY_SIZE="2048"
+            ;;
+        2)
+            DH_KEY_SIZE="3072"
+            ;;
+        3)
+            DH_KEY_SIZE="4096"
+            ;;
+    esac
+    echo ""
+    echo "Choose what size of RSA key you want to use:"
+    echo "   1) 2048 bits (fastest)"
+    echo "   2) 3072 bits (recommended, best compromise)"
+    echo "   3) 4096 bits (most secure)"
+    while [[ $RSA_KEY_SIZE != "1" && $RSA_KEY_SIZE != "2" && $RSA_KEY_SIZE != "3" ]]; do
+        read -p "RSA key size [1-3]: " -e -i 2 RSA_KEY_SIZE
+    done
+    case $RSA_KEY_SIZE in
+        1)
+            RSA_KEY_SIZE="2048"
+            ;;
+        2)
+            RSA_KEY_SIZE="3072"
+            ;;
+        3)
+            RSA_KEY_SIZE="4096"
+            ;;
+    esac
+    echo ""
+    echo "Finally, tell me a name for the client certificate and configuration"
+    while [[ $CLIENT = "" ]]; do
+        echo "Please, use one word only, no special characters"
+        read -p "Client name: " -e -i client CLIENT
+    done
+    echo ""
+    echo "Okay, that was all I needed. We are ready to setup your OpenVPN server now"
+    read -n1 -r -p "Press any key to continue..."
 
-	if [[ "$OS" = 'debian' ]]; then
-		apt-get install ca-certificates -y
-		# We add the OpenVPN repo to get the latest version.
-		# Debian 7
-		if [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then
-			echo "deb http://build.openvpn.net/debian/openvpn/stable wheezy main" > /etc/apt/sources.list.d/openvpn.list
-			wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
-			apt-get update
-		fi
-		# Debian 8
-		if [[ "$VERSION_ID" = 'VERSION_ID="8"' ]]; then
-			echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
-			wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
-			apt update
-		fi
-		# Ubuntu 12.04
-		if [[ "$VERSION_ID" = 'VERSION_ID="12.04"' ]]; then
-			echo "deb http://build.openvpn.net/debian/openvpn/stable precise main" > /etc/apt/sources.list.d/openvpn.list
-			wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
-			apt-get update
-		fi
-		# Ubuntu 14.04
-		if [[ "$VERSION_ID" = 'VERSION_ID="14.04"' ]]; then
-			echo "deb http://build.openvpn.net/debian/openvpn/stable trusty main" > /etc/apt/sources.list.d/openvpn.list
-			wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
-			apt-get update
-		fi
-		# Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
-		# The we install OpenVPN
-		apt-get install openvpn iptables openssl wget ca-certificates curl -y
-		# Install iptables service
-		if [[ ! -e /etc/systemd/system/iptables.service ]]; then
-			mkdir /etc/iptables
-			iptables-save > /etc/iptables/iptables.rules
-			echo "#!/bin/sh
+    if [[ "$OS" = 'debian' ]]; then
+        apt-get install ca-certificates -y
+        # We add the OpenVPN repo to get the latest version.
+        # Debian 7
+        if [[ "$VERSION_ID" = 'VERSION_ID="7"' ]]; then
+            echo "deb http://build.openvpn.net/debian/openvpn/stable wheezy main" > /etc/apt/sources.list.d/openvpn.list
+            wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
+            apt-get update
+        fi
+        # Debian 8
+        if [[ "$VERSION_ID" = 'VERSION_ID="8"' ]]; then
+            echo "deb http://build.openvpn.net/debian/openvpn/stable jessie main" > /etc/apt/sources.list.d/openvpn.list
+            wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
+            apt update
+        fi
+        # Ubuntu 12.04
+        if [[ "$VERSION_ID" = 'VERSION_ID="12.04"' ]]; then
+            echo "deb http://build.openvpn.net/debian/openvpn/stable precise main" > /etc/apt/sources.list.d/openvpn.list
+            wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
+            apt-get update
+        fi
+        # Ubuntu 14.04
+        if [[ "$VERSION_ID" = 'VERSION_ID="14.04"' ]]; then
+            echo "deb http://build.openvpn.net/debian/openvpn/stable trusty main" > /etc/apt/sources.list.d/openvpn.list
+            wget -O - https://swupdate.openvpn.net/repos/repo-public.gpg | apt-key add -
+            apt-get update
+        fi
+        # Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
+        # The we install OpenVPN
+        apt-get install openvpn iptables openssl wget ca-certificates curl -y
+        # Install iptables service
+        if [[ ! -e /etc/systemd/system/iptables.service ]]; then
+            mkdir /etc/iptables
+            iptables-save > /etc/iptables/iptables.rules
+            echo "#!/bin/sh
 iptables -F
 iptables -X
 iptables -t nat -F
@@ -364,9 +365,9 @@ iptables -t mangle -F
 iptables -t mangle -X
 iptables -P INPUT ACCEPT
 iptables -P FORWARD ACCEPT
-iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
-			chmod +x /etc/iptables/flush-iptables.sh
-			echo "[Unit]
+            iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
+            chmod +x /etc/iptables/flush-iptables.sh
+            echo "[Unit]
 Description=Packet Filtering Framework
 DefaultDependencies=no
 Before=network-pre.target
@@ -378,18 +379,18 @@ ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
 ExecStop=/etc/iptables/flush-iptables.sh
 RemainAfterExit=yes
 [Install]
-WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
-			systemctl daemon-reload
-			systemctl enable iptables.service
-		fi
-	elif [[ "$OS" = 'centos' ]]; then
-		yum install epel-release -y
-		yum install openvpn iptables openssl wget ca-certificates curl -y
-		# Install iptables service
-		if [[ ! -e /etc/systemd/system/iptables.service ]]; then
-			mkdir /etc/iptables
-			iptables-save > /etc/iptables/iptables.rules
-			echo "#!/bin/sh
+            WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
+            systemctl daemon-reload
+            systemctl enable iptables.service
+        fi
+    elif [[ "$OS" = 'centos' ]]; then
+        yum install epel-release -y
+        yum install openvpn iptables openssl wget ca-certificates curl -y
+        # Install iptables service
+        if [[ ! -e /etc/systemd/system/iptables.service ]]; then
+            mkdir /etc/iptables
+            iptables-save > /etc/iptables/iptables.rules
+            echo "#!/bin/sh
 iptables -F
 iptables -X
 iptables -t nat -F
@@ -398,9 +399,9 @@ iptables -t mangle -F
 iptables -t mangle -X
 iptables -P INPUT ACCEPT
 iptables -P FORWARD ACCEPT
-iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
-			chmod +x /etc/iptables/flush-iptables.sh
-			echo "[Unit]
+            iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
+            chmod +x /etc/iptables/flush-iptables.sh
+            echo "[Unit]
 Description=Packet Filtering Framework
 DefaultDependencies=no
 Before=network-pre.target
@@ -412,79 +413,79 @@ ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
 ExecStop=/etc/iptables/flush-iptables.sh
 RemainAfterExit=yes
 [Install]
-WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
-			systemctl daemon-reload
-			systemctl enable iptables.service
-			# Disable firewalld to allow iptables to start upon reboot
-			systemctl disable firewalld
-		fi
-	else
-		# Else, the distro is ArchLinux
-		echo ""
-		echo ""
-		echo "As you're using ArchLinux, I need to update the packages on your system to install those I need."
-		echo "Not doing that could cause problems between dependencies, or missing files in repositories."
-		echo ""
-		echo "Continuing will update your installed packages and install needed ones."
-		while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
-			read -p "Continue ? [y/n]: " -e -i y CONTINUE
-		done
-		if [[ "$CONTINUE" = "n" ]]; then
-			echo "Ok, bye !"
-			exit 4
-		fi
+            WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
+            systemctl daemon-reload
+            systemctl enable iptables.service
+            # Disable firewalld to allow iptables to start upon reboot
+            systemctl disable firewalld
+        fi
+    else
+        # Else, the distro is ArchLinux
+        echo ""
+        echo ""
+        echo "As you're using ArchLinux, I need to update the packages on your system to install those I need."
+        echo "Not doing that could cause problems between dependencies, or missing files in repositories."
+        echo ""
+        echo "Continuing will update your installed packages and install needed ones."
+        while [[ $CONTINUE != "y" && $CONTINUE != "n" ]]; do
+            read -p "Continue ? [y/n]: " -e -i y CONTINUE
+        done
+        if [[ "$CONTINUE" = "n" ]]; then
+            echo "Ok, bye !"
+            exit 4
+        fi
 
-		if [[ "$OS" = 'arch' ]]; then
-			# Install dependencies
-			pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
-			iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
-			systemctl daemon-reload
-			systemctl enable iptables
-			systemctl start iptables
-		fi
-	fi
-	# Find out if the machine uses nogroup or nobody for the permissionless group
-	if grep -qs "^nogroup:" /etc/group; then
-		NOGROUP=nogroup
-	else
-		NOGROUP=nobody
-	fi
+        if [[ "$OS" = 'arch' ]]; then
+            # Install dependencies
+            pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
+            iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
+            systemctl daemon-reload
+            systemctl enable iptables
+            systemctl start iptables
+        fi
+    fi
+    # Find out if the machine uses nogroup or nobody for the permissionless group
+    if grep -qs "^nogroup:" /etc/group; then
+        NOGROUP=nogroup
+    else
+        NOGROUP=nobody
+    fi
 
-	# An old version of easy-rsa was available by default in some openvpn packages
-	if [[ -d /etc/openvpn/easy-rsa/ ]]; then
-		rm -rf /etc/openvpn/easy-rsa/
-	fi
-	# Get easy-rsa
-	wget -O ~/EasyRSA-3.0.3.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.3/EasyRSA-3.0.3.tgz
-	tar xzf ~/EasyRSA-3.0.3.tgz -C ~/
-	mv ~/EasyRSA-3.0.3/ /etc/openvpn/
-	mv /etc/openvpn/EasyRSA-3.0.3/ /etc/openvpn/easy-rsa/
-	chown -R root:root /etc/openvpn/easy-rsa/
-	rm -rf ~/EasyRSA-3.0.3.tgz
-	cd /etc/openvpn/easy-rsa/
-	echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
-	# Create the PKI, set up the CA, the DH params and the server + client certificates
-	./easyrsa init-pki
-	./easyrsa --batch build-ca nopass
-	openssl dhparam -out dh.pem $DH_KEY_SIZE
-	./easyrsa build-server-full server nopass
-	./easyrsa build-client-full $CLIENT nopass
-	EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
-	# generate tls-auth key
-	openvpn --genkey --secret /etc/openvpn/tls-auth.key
-	# Move all the generated files
-	cp pki/ca.crt pki/private/ca.key dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
-	# Make cert revocation list readable for non-root
-	chmod 644 /etc/openvpn/crl.pem
+    # An old version of easy-rsa was available by default in some openvpn packages
+    if [[ -d /etc/openvpn/easy-rsa/ ]]; then
+        rm -rf /etc/openvpn/easy-rsa/
+    fi
+    # Get easy-rsa
+    wget -O ~/EasyRSA-3.0.3.tgz https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.3/EasyRSA-3.0.3.tgz
+    tar xzf ~/EasyRSA-3.0.3.tgz -C ~/
+    mv ~/EasyRSA-3.0.3/ /etc/openvpn/
+    mv /etc/openvpn/EasyRSA-3.0.3/ /etc/openvpn/easy-rsa/
+    chown -R root:root /etc/openvpn/easy-rsa/
+    rm -rf ~/EasyRSA-3.0.3.tgz
+    cd /etc/openvpn/easy-rsa/
+    echo "set_var EASYRSA_KEY_SIZE $RSA_KEY_SIZE" > vars
+    # Create the PKI, set up the CA, the DH params and the server + client certificates
+    ./easyrsa init-pki
+    ./easyrsa --batch build-ca nopass
+    openssl dhparam -out dh.pem $DH_KEY_SIZE
+    ./easyrsa build-server-full server nopass
+    ./easyrsa build-client-full $CLIENT nopass
+    EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
+    # generate tls-auth key
+    openvpn --genkey --secret /etc/openvpn/tls-auth.key
+    # Move all the generated files
+    cp pki/ca.crt pki/private/ca.key dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn/easy-rsa/pki/crl.pem /etc/openvpn
+    # Make cert revocation list readable for non-root
+    chmod 644 /etc/openvpn/crl.pem
 
-	# Generate server.conf
-	echo "port $PORT" > /etc/openvpn/server.conf
-	if [[ "$PROTOCOL" = 'UDP' ]]; then
-		echo "proto udp" >> /etc/openvpn/server.conf
-	elif [[ "$PROTOCOL" = 'TCP' ]]; then
-		echo "proto tcp" >> /etc/openvpn/server.conf
-	fi
-	echo "dev tun
+    # Generate server.conf
+    echo "port $PORT" > /etc/openvpn/server.conf
+    if [[ "$PROTOCOL" = 'UDP' ]]; then
+        echo "proto udp" >> /etc/openvpn/server.conf
+    elif [[ "$PROTOCOL" = 'TCP' ]]; then
+        echo "proto tcp" >> /etc/openvpn/server.conf
+    fi
+    echo "dev tun
 user nobody
 group $NOGROUP
 persist-key
@@ -492,45 +493,45 @@ persist-tun
 keepalive 10 120
 topology subnet
 server 10.8.0.0 255.255.255.0
-ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
-	# DNS resolvers
-	case $DNS in
-		1)
-		# Obtain the resolvers from resolv.conf and use them for OpenVPN
-		grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
-			echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
-		done
-		;;
-		2) #Quad9
-		echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server.conf
-		;;
-		3) #FDN
-		echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
-		echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
-		;;
-		4) #DNS.WATCH
-		echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
-		echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
-		;;
-		5) #OpenDNS
-		echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
-		echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
-		;;
-		6) #Google
-		echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
-		echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
-		;;
-		7) #Yandex Basic
-		echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
-		echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
-		;;
-		8) #AdGuard DNS
-		echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
-		echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
-		;;
-	esac
-echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
-echo "crl-verify crl.pem
+    ifconfig-pool-persist ipp.txt" >> /etc/openvpn/server.conf
+    # DNS resolvers
+    case $DNS in
+        1)
+            # Obtain the resolvers from resolv.conf and use them for OpenVPN
+            grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
+                echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
+            done
+            ;;
+        2) #Quad9
+            echo 'push "dhcp-option DNS 9.9.9.9"' >> /etc/openvpn/server.conf
+            ;;
+        3) #FDN
+            echo 'push "dhcp-option DNS 80.67.169.12"' >> /etc/openvpn/server.conf
+            echo 'push "dhcp-option DNS 80.67.169.40"' >> /etc/openvpn/server.conf
+            ;;
+        4) #DNS.WATCH
+            echo 'push "dhcp-option DNS 84.200.69.80"' >> /etc/openvpn/server.conf
+            echo 'push "dhcp-option DNS 84.200.70.40"' >> /etc/openvpn/server.conf
+            ;;
+        5) #OpenDNS
+            echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
+            echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
+            ;;
+        6) #Google
+            echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
+            echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
+            ;;
+        7) #Yandex Basic
+            echo 'push "dhcp-option DNS 77.88.8.8"' >> /etc/openvpn/server.conf
+            echo 'push "dhcp-option DNS 77.88.8.1"' >> /etc/openvpn/server.conf
+            ;;
+        8) #AdGuard DNS
+            echo 'push "dhcp-option DNS 176.103.130.130"' >> /etc/openvpn/server.conf
+            echo 'push "dhcp-option DNS 176.103.130.131"' >> /etc/openvpn/server.conf
+            ;;
+    esac
+    echo 'push "redirect-gateway def1 bypass-dhcp" '>> /etc/openvpn/server.conf
+    echo "crl-verify crl.pem
 ca ca.crt
 cert server.crt
 key server.key
@@ -542,126 +543,129 @@ tls-server
 tls-version-min 1.2
 tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
 status openvpn.log
-verb 3" >> /etc/openvpn/server.conf
+    verb 3" >> /etc/openvpn/server.conf
 
-	# Create the sysctl configuration file if needed (mainly for Arch Linux)
-	if [[ ! -e $SYSCTL ]]; then
-		touch $SYSCTL
-	fi
+    # Create the sysctl configuration file if needed (mainly for Arch Linux)
+    if [[ ! -e $SYSCTL ]]; then
+        touch $SYSCTL
+    fi
 
-	# Enable net.ipv4.ip_forward for the system
-	sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' $SYSCTL
-	if ! grep -q "\<net.ipv4.ip_forward\>" $SYSCTL; then
-		echo 'net.ipv4.ip_forward=1' >> $SYSCTL
-	fi
-	# Avoid an unneeded reboot
-	echo 1 > /proc/sys/net/ipv4/ip_forward
-	# Set NAT for the VPN subnet
-	iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
-	# Save persitent iptables rules
-	iptables-save > $IPTABLES
-	if pgrep firewalld; then
-		# We don't use --add-service=openvpn because that would only work with
-		# the default port. Using both permanent and not permanent rules to
-		# avoid a firewalld reload.
-		if [[ "$PROTOCOL" = 'UDP' ]]; then
-			firewall-cmd --zone=public --add-port=$PORT/udp
-			firewall-cmd --permanent --zone=public --add-port=$PORT/udp
-		elif [[ "$PROTOCOL" = 'TCP' ]]; then
-			firewall-cmd --zone=public --add-port=$PORT/tcp
-			firewall-cmd --permanent --zone=public --add-port=$PORT/tcp
-		fi
-		firewall-cmd --zone=trusted --add-source=10.8.0.0/24
-		firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
-	fi
-	if iptables -L -n | grep -qE 'REJECT|DROP'; then
-		# If iptables has at least one REJECT rule, we asume this is needed.
-		# Not the best approach but I can't think of other and this shouldn't
-		# cause problems.
-		if [[ "$PROTOCOL" = 'UDP' ]]; then
-			iptables -I INPUT -p udp --dport $PORT -j ACCEPT
-		elif [[ "$PROTOCOL" = 'TCP' ]]; then
-			iptables -I INPUT -p tcp --dport $PORT -j ACCEPT
-		fi
-		iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
-		iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
-		# Save persitent OpenVPN rules
+    # Enable net.ipv4.ip_forward for the system
+    sed -i '/\<net.ipv4.ip_forward\>/c\net.ipv4.ip_forward=1' $SYSCTL
+    if ! grep -q "\<net.ipv4.ip_forward\>" $SYSCTL; then
+        echo 'net.ipv4.ip_forward=1' >> $SYSCTL
+    fi
+    # Avoid an unneeded reboot
+    echo 1 > /proc/sys/net/ipv4/ip_forward
+    # Set NAT for the VPN subnet
+    iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
+    # Save persitent iptables rules
+    iptables-save > $IPTABLES
+    if pgrep firewalld; then
+        # We don't use --add-service=openvpn because that would only work with
+        # the default port. Using both permanent and not permanent rules to
+        # avoid a firewalld reload.
+        if [[ "$PROTOCOL" = 'UDP' ]]; then
+            firewall-cmd --zone=public --add-port=$PORT/udp
+            firewall-cmd --permanent --zone=public --add-port=$PORT/udp
+        elif [[ "$PROTOCOL" = 'TCP' ]]; then
+            firewall-cmd --zone=public --add-port=$PORT/tcp
+            firewall-cmd --permanent --zone=public --add-port=$PORT/tcp
+        fi
+        firewall-cmd --zone=trusted --add-source=10.8.0.0/24
+        firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
+    fi
+    if iptables -L -n | grep -qE 'REJECT|DROP'; then
+        # If iptables has at least one REJECT rule, we asume this is needed.
+        # Not the best approach but I can't think of other and this shouldn't
+        # cause problems.
+        if [[ "$PROTOCOL" = 'UDP' ]]; then
+            iptables -I INPUT -p udp --dport $PORT -j ACCEPT
+        elif [[ "$PROTOCOL" = 'TCP' ]]; then
+            iptables -I INPUT -p tcp --dport $PORT -j ACCEPT
+        fi
+        iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
+        iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
+        # Save persitent OpenVPN rules
         iptables-save > $IPTABLES
-	fi
-	# If SELinux is enabled and a custom port was selected, we need this
-	if hash sestatus 2>/dev/null; then
-		if sestatus | grep "Current mode" | grep -qs "enforcing"; then
-			if [[ "$PORT" != '1194' ]]; then
-				# semanage isn't available in CentOS 6 by default
-				if ! hash semanage 2>/dev/null; then
-					yum install policycoreutils-python -y
-				fi
-				if [[ "$PROTOCOL" = 'UDP' ]]; then
-					semanage port -a -t openvpn_port_t -p udp $PORT
-				elif [[ "$PROTOCOL" = 'TCP' ]]; then
-					semanage port -a -t openvpn_port_t -p tcp $PORT
-				fi
-			fi
-		fi
-	fi
-	# And finally, restart OpenVPN
-	if [[ "$OS" = 'debian' ]]; then
-		# Little hack to check for systemd
-		if pgrep systemd-journal; then
-			if [[ "$VERSION_ID" = 'VERSION_ID="9"' ]]; then
-				#Workaround to fix OpenVPN service on Debian 9 OpenVZ
-				sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn-server\@.service
-				sed -i 's|/etc/openvpn/server|/etc/openvpn|' /lib/systemd/system/openvpn-server\@.service
-				sed -i 's|%i.conf|server.conf|' /lib/systemd/system/openvpn-server\@.service
-				systemctl daemon-reload
-				systemctl restart openvpn-server@openvpn.service
-				systemctl enable openvpn-server@openvpn.service
-			else
-				systemctl restart openvpn@server.service
-			fi
-		else
-			/etc/init.d/openvpn restart
-		fi
-	else
-		if pgrep systemd-journal; then
-			if [[ "$OS" = 'arch' ]]; then
-				#Workaround to avoid rewriting the entire script for Arch
-				sed -i 's|/etc/openvpn/server|/etc/openvpn|' /usr/lib/systemd/system/openvpn-server@.service
-				sed -i 's|%i.conf|server.conf|' /usr/lib/systemd/system/openvpn-server@.service
-				systemctl daemon-reload
-				systemctl restart openvpn-server@openvpn.service
-				systemctl enable openvpn-server@openvpn.service
-			else
-				systemctl restart openvpn@server.service
-				systemctl enable openvpn@server.service
-			fi
-		else
-			service openvpn restart
-			chkconfig openvpn on
-		fi
-	fi
-	# Try to detect a NATed connection and ask about it to potential LowEndSpirit/Scaleway users
-	EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
-	if [[ "$IP" != "$EXTERNALIP" ]]; then
-		echo ""
-		echo "Looks like your server is behind a NAT!"
-		echo ""
+    fi
+    # If SELinux is enabled and a custom port was selected, we need this
+    if hash sestatus 2>/dev/null; then
+        if sestatus | grep "Current mode" | grep -qs "enforcing"; then
+            if [[ "$PORT" != '1194' ]]; then
+                # semanage isn't available in CentOS 6 by default
+                if ! hash semanage 2>/dev/null; then
+                    yum install policycoreutils-python -y
+                fi
+                if [[ "$PROTOCOL" = 'UDP' ]]; then
+                    semanage port -a -t openvpn_port_t -p udp $PORT
+                elif [[ "$PROTOCOL" = 'TCP' ]]; then
+                    semanage port -a -t openvpn_port_t -p tcp $PORT
+                fi
+            fi
+        fi
+    fi
+    # And finally, restart OpenVPN
+    if [[ "$OS" = 'debian' ]]; then
+        # Little hack to check for systemd
+        if pgrep systemd-journal; then
+            if [[ "$VERSION_ID" = 'VERSION_ID="9"' ]]; then
+                #Workaround to fix OpenVPN service on Debian 9 OpenVZ
+                sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn-server\@.service
+                sed -i 's|/etc/openvpn/server|/etc/openvpn|' /lib/systemd/system/openvpn-server\@.service
+                sed -i 's|%i.conf|server.conf|' /lib/systemd/system/openvpn-server\@.service
+                systemctl daemon-reload
+                systemctl restart openvpn-server\@openvpn.service
+                systemctl enable openvpn-server\@openvpn.service
+            else
+                sed -i 's|LimitNPROC|#LimitNPROC|' /lib/systemd/system/openvpn\@.service
+                systemctl daemon-reload
+                systemctl restart openvpn\@server.service
+            fi
+        else
+            /etc/init.d/openvpn restart
+        fi
+    else
+        if pgrep systemd-journal; then
+            if [[ "$OS" = 'arch' ]] || [[ "$VERSION_ID" = 'VERSION_ID="16.04"' ]]; then
+                #Workaround to avoid rewriting the entire script for Arch
+                sed -i 's|LimitNPROC|#LimitNPROC|' /usr/lib/systemd/system/openvpn-server\@.service
+                sed -i 's|/etc/openvpn/server|/etc/openvpn|' /usr/lib/systemd/system/openvpn-server\@.service
+                sed -i 's|%i.conf|server.conf|' /usr/lib/systemd/system/openvpn-server\@.service
+                systemctl daemon-reload
+                systemctl restart openvpn-server\@openvpn.service
+                systemctl enable openvpn-server\@openvpn.service
+            else
+                systemctl restart openvpn\@server.service
+                systemctl enable openvpn\@server.service
+            fi
+        else
+            service openvpn restart
+            chkconfig openvpn on
+        fi
+    fi
+    # Try to detect a NATed connection and ask about it to potential LowEndSpirit/Scaleway users
+    EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
+    if [[ "$IP" != "$EXTERNALIP" ]]; then
+        echo ""
+        echo "Looks like your server is behind a NAT!"
+        echo ""
         echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
         echo "then I need to know the address that can be used to access it from outside."
         echo "If that's not the case, just ignore this and leave the next field blank"
         read -p "External IP or domain name: " -e USEREXTERNALIP
-		if [[ "$USEREXTERNALIP" != "" ]]; then
-			IP=$USEREXTERNALIP
-		fi
-	fi
-	# client-template.txt is created so we have a template to add further users later
-	echo "client" > /etc/openvpn/client-template.txt
-	if [[ "$PROTOCOL" = 'UDP' ]]; then
-		echo "proto udp" >> /etc/openvpn/client-template.txt
-	elif [[ "$PROTOCOL" = 'TCP' ]]; then
-		echo "proto tcp-client" >> /etc/openvpn/client-template.txt
-	fi
-	echo "remote $IP $PORT
+        if [[ "$USEREXTERNALIP" != "" ]]; then
+            IP=$USEREXTERNALIP
+        fi
+    fi
+    # client-template.txt is created so we have a template to add further users later
+    echo "client" > /etc/openvpn/client-template.txt
+    if [[ "$PROTOCOL" = 'UDP' ]]; then
+        echo "proto udp" >> /etc/openvpn/client-template.txt
+    elif [[ "$PROTOCOL" = 'TCP' ]]; then
+        echo "proto tcp-client" >> /etc/openvpn/client-template.txt
+    fi
+    echo "remote $IP $PORT
 dev tun
 resolv-retry infinite
 nobind
@@ -675,14 +679,14 @@ tls-client
 tls-version-min 1.2
 tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256
 setenv opt block-outside-dns
-verb 3" >> /etc/openvpn/client-template.txt
+    verb 3" >> /etc/openvpn/client-template.txt
 
-	# Generate the custom client.ovpn
-	newclient "$CLIENT"
-	echo ""
-	echo "Finished!"
-	echo ""
-	echo "Your client config is available at $homeDir/$CLIENT.ovpn"
-	echo "If you want to add more clients, you simply need to run this script another time!"
+    # Generate the custom client.ovpn
+    newclient "$CLIENT"
+    echo ""
+    echo "Finished!"
+    echo ""
+    echo "Your client config is available at $homeDir/$CLIENT.ovpn"
+    echo "If you want to add more clients, you simply need to run this script another time!"
 fi
 exit 0;