Linux Port Forwarding

[asimo]

configuer http reverse proxy

also
how to forward port 8081 to 8080

[Lazydog]

With REDIRECT

[NixSavy]

Try this

--iptables -A INPUT -i eth0 -p tcp --dport 8081 -j ACCEPT
--iptables -A INPUT -i eth0 -p tcp --dport 8080 -j ACCEPT
--iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 8081 -j REDIRECT --to-port 8080

[Lazydog]

Try this

--iptables -A INPUT -i eth0 -p tcp --dport 8081 -j ACCEPT
--iptables -A INPUT -i eth0 -p tcp --dport 8080 -j ACCEPT
--iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 8081 -j REDIRECT --to-port 8080

The first rule is not necessary as you are not looking to allow port 8081 to connect. The last rule will change the port before any routing is done.