Re-routing with iptables

Question

When x.x.x.x makes a request on port 80 to y.y.y.y I would like the request to be redirected to z.z.z.z:80. Is it possible to do this by adding rules to iptables on y.y.y.y?

Answer 1

You probably want to use DNAT to rewrite the destination IP address, something like this:

iptables -t nat -A PREROUTING -p tcp -s x.x.x.x -d y.y.y.y --dport 80 -j DNAT --to-destination z.z.z.z:80

Answer 2

Final solution as follows:

echo 1 > /proc/sys/net/ipv4/ip_forward
iptables -t nat -A PREROUTING -p tcp -s x.x.x.x -d y.y.y.y --dport 80 -j DNAT --to-destination z.z.z.z:80
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

where eth0 is outside interface on y.y.y.y.