Use custom interface to connect to some IPs.

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http://ubuntuforums.org – I have two interfaces: wlan0 and eth0 connected to a different networks. I would like to use one interface (eth0) to work as a default most of the time (it is used all of the time right now) and sometimes (to some IPs, some webpages, and mostly to irc channels) I want to use the other interface wlan0. How can I achieve it? Is it possible? I was looking for a setting in irssi, which iface to use, but I have found nothing. (Hardware)