Tried posting this in Security, but I didn't get any replies.

Recently, someone from a Chatango room I frequent got my IP address and has been doing DoS attacks on me, and I actually had to call my ISP and get them to change my IP. I've gotten some proxy servers I can use and I've configured Firefox to use them, but unfortunately, Chatango rooms use Flash, and the Adobe Flash plugin for Ubuntu (which is the one I'm using) uses your main Internet connection, rather than going through the Proxy that's specified for Firefox. So what this means is the proxy is basically useless for me. I've verified that when I go into the chatroom, my actual IP is the one that's being used, and not that of the proxy server.

So I was wondering if there's any way to configure all Internet traffic to use the proxy server, rather than just configuring Firefox to do it?

Any help is greatly appreciated.