vps# iptables -t nat -A PREROUTING  -p tcp --dport 9987 -j DNAT --to-destination 192.168.1.3 (mein Homeserver wenn ich richtig verstanden habe)
vps# iptables -t nat -A POSTROUTING -p tcp --dport 9987 -j MASQUERADE

vps# iptables -t nat -A PREROUTING  -p tcp --dport 30033 -j DNAT --to-destination 192.168.1.3
vps# iptables -t nat -A POSTROUTING -p tcp --dport 30033 -j MASQUERADE

vps# iptables -t nat -A PREROUTING  -p tcp --dport 10011 -j DNAT --to-destination 192.168.1.3
vps# iptables -t nat -A POSTROUTING -p tcp --dport 10011 -j MASQUERADE

Port forwarding using OpenVPN client

sysctl -w net.ipv4.ip_forward=1

iptables -t nat -A PREROUTING -d 50.xxx.xxx.xxx -p tcp --dport 8081 -j DNAT --to-dest 192.168.2.86:8081

iptables -t nat -A POSTROUTING -d 192.168.2.86 -p tcp --dport 8081 -j SNAT --to-source 10.0.2.42