port forwarding

TimBeR · 10-10-2001, 07:11 PM

I recently upgraded from redhat 6.2 to 7.1 and after I did this my ipchains are working but my port_forwarding is not this is what I get

ipmasqadm portfw -a -P udp -L external_ip 888 -R 10.0.0.2 888

portfw: setsockopt failed: Invalid argument

any sugestions on what I can do to fix this would be greatly appriciated.

warath · 10-12-2001, 01:29 PM

You have to use iptables, and disable ipchains.

then do this to port forward

/sbin/iptables -t nat -A PREROUTING -p tcp -d $IP --dport 1212 -j DNAT --to $ryan:1212

which is saying
incomming connection to $IP (the internet ip of the router/server) destination port 1212, forward to IP $ryan port 1212

hope that helps