Just a little status update with the filter (so don't worry - I haven't abandoned it). I'm having some problems getting the bind-in-front trick to work - it works with the Winsock control in VB6 and netcat, it works with JJ2 and netcat, but it doesn't work with VB6 and JJ2. So I'm currently trying to work out what netcat does differently with networking stuff.

Thanks for the offer, Link. I'm currently trying to get something solid working first, before I add filtering to it. But this could concieveably be used to block most network attacks, as I intend to proxy both the TCP and UDP traffic. I intend to add support for special commands sent through the chat system, to allow kicking and banning to work (because of how this works JJ2 would see all connections as coming from localhost, and so kicking/banning by IP would just boot everyone off).

As soon as I've got something that works, I'll post it here for people to test and attempt to break. Unfortuantly I can't host or join JJ2 myself, due to router issues (if anyone knows the magic incanctations needed to make a Vigor 2200USB work with JJ2, I'd be grateful).