How can I get two Macs using iChat to link directly without Bonjour/multicast?

[mcs37]

I've got two Macs on a network with a particular network configuration such that multicast is not supported (VPNs are involved here). As such, I can login to Bonjour messaging, but I can't see anyone and they can't see me. I can ping the IP address of the target machine no problem, so all I want to be able to do is say, hey Mac, connect to this machine directly for iChat!

I can't find any such option. Please help!

 

[varmit]

I've got two Macs on a network with a particular network configuration such that multicast is not supported (VPNs are involved here). As such, I can login to Bonjour messaging, but I can't see anyone and they can't see me. I can ping the IP address of the target machine no problem, so all I want to be able to do is say, hey Mac, connect to this machine directly for iChat!

I can't find any such option. Please help!

If you can't use Bonjour, then you need a common connection point the middle. The only thing that I can think of that is cheap and free is setting up a Jabber server.