D-Link DSL-2640U

Routing and Nat with IPtables
Commands


Port Forwarding:
iptables -A INPUT -p tcp -i nas_0_0_35 -d 192.168.1.2 --dport 27015 -j ACCEPT
iptables -A INPUT -p udp -i nas_0_0_35 -d 192.168.1.2 --dport 27015 -j ACCEPT

iptables -A FORWARD -p udp -i nas_0_0_35 -d 192.168.1.2 --dport 27015 -j ACCEPT
iptables -A FORWARD -p tcp -i nas_0_0_35 -d 192.168.1.2 --dport 27015 -j ACCEPT