On 7/18/07, . . <msucka0xff at programmer.net> wrote:
> See http://wiki.blitzed.org/BOPM
> According to modemhero, as I understand it, his server was being flooded
> with proxy server/tor style bogus connects causing legit users to be blocked
> from connecting. One possible solution is integrating something IRC servers
> have used to eradicate these types of attacks.
> How does it work?
> When a client connects to the IRC server, BOPM scans the client for open
> proxies. It then determines whether they are really open by using them to
> connect back to the server.

Yes I noticed freenode.net does this for their IRC servers.