forwarding a specific port from eth0 to eth1

zovres · 08-05-2003, 12:10 PM

how can I do such a thing?

I have two network cards on a redhat9 computer and I want to forward ssh requests that comes to eth0 to a computer connected with eth1

PC1----ssh---->eth0,PC2,eth1-----ssh---->PC3

so that I can ssh from PC1 to PC3

thx for any help

jpbarto · 08-05-2003, 12:47 PM

I think iptables can provide this type of redirecting

vimal · 05-02-2006, 10:01 PM

Hello zovres,

You can do port forwarding using the NAT function in iptables. For this you need the 'iptables_nat' and 'ip_conntrack' modules loaded.

# iptables -t nat -A PREROUTING -d 'IP of eth0' -p tcp --dport 22 -j DNAT --to 'IP of eth1'.

After issuiong this command please restart iptables. I hope this simple redirection would work for you. Please reply if anything comes up.