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Yet another NAT / iChat fix Network
If you and the person you want to iChat to are both behind NATs, you could forward the ports at one or both ends (5060, 5190, 5297, 5298, 5678, 16384-16403). But what if both ends are unable to forward these ports (maybe it's not your network, or you can't) -- you wouldn't be able to iChat.

However, Hamachi supports Bonjour properly, and has an OS X version. If both of you fire up Hamachi, you can use iChat's Bonjour features to chat between you and the other person, over the internet, with audio and video chat. The disadvantage is that the CPU load may be a fair bit higher due to Hamachi's tunneling overhead. It works great for me -- I've done it, doing audio chats on a 12" 1.33GHZ PowerBook G4 to someone on a 1.0GHZ 12" PowerBook, and not noticed any system slowdown.

Is this a hint? It's not obvious to most others -- whenever I suggest it to someone else, I get a strange look from them as if it's a long way round, and usually get told it's not going to work. But it does, and does well.

[robg adds: We discussed Hamachi in this previous hint.]
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