Hi. i am running ubuntu 8.04 in a laptop.
through the wired connection i am currently connected to an aDSL modem router Linksys wag354g. My network is 192.168.1.0 /24
Also my neighbor has the same model of router and i am connected through the wireless of my laptop to his router. His network is 172.16.1.0 /24

My question is how to connect to both networks simultaneously and divide the traffic between the two connections based on application. For example i would like to have the internet browsing to go through the wired connection (network 192.168.1.0) and all the other traffic through the wireless connection (network 172.16.1.0).

Any ideas anyone?

I'm definitely no expert, but I would think the problem comes in where there is only one IP address provided to your computer. I'm not sure of the possibility of assigning two IPs to one PC. I don't think what you want to do is possible? I'm looking forward to being corrected and seeing what the experts have to say on this.

Use iptables.

You can prevent HTTP traffic from using the wireless connection by using

Code:

iptables -A OUTPUT -s 172.16.1.0/24 -p tcp --dport 80 -j DROP

You can prevent all non-HTTP traffic from using the wired connection by using

Code:

iptables -A OUTPUT -s 192.168.1.0/24 -p tcp ! --dport 80 -j DROP

You will also want to add similar rulres for HTTPS (--dport 443).

WARNING: I do not have a way of completely testing this at the moment, but this should put you on the right track.