Hi everyone,

I'm trying to set up OpenWRT with multiple external WAN IPs. I have set them as aliases to the WAN interface.

The problem lies when I need to route traffic coming to a particular WAN IP to an internal host, but with a specific port.

For example:
Internet -> 1.1.1.1:80 >-mapto-> 192.168.1.2:80
Internet -> 1.1.1.2:80 >-mapto-> 192.168.1.3:80

I was hoping someone would be graciously able to help me achieve this. I've already bricked the router once trying to do this. :-(

Thanks!

You could probably use the firewall redirect

config 'redirect'
    option '_name' 'example'
    option 'src' 'wan'
    option 'proto' 'tcp'
    option 'dest_ip' '192.168.1.2'
    option 'dest_port' '80'
    option 'target' 'DNAT'
    option 'dest' 'lan'
    option 'src_dip' '1.1.1.1'
    option 'src_dport' '80'

Thanks for the reply.

I did end up working it out by using DNAT and SNAT - I just didn't understand them enough when I started.

You can add firewall rules directly:
iptables -t nat -A PREROUTING -d 1.1.1.1 -p tcp --dport 80 -j DNAT --to 192.168.1.2:80