I'm pretty sure the NAT will update with any change in DHCP. My old router kept track of NAT by MAC address, which make much more sense. I have a new router that does it by IP address, and I was wondering the same thing as you. I just went with it and decided to find out if and when the IP changed. So far it hasn't.

In other news, I'll agree with other posters here who poopoo iChat. And for that matter any bonjour service. There are way too many ports used, and if you have to forward them in a range, you may as well just drop your trousers and default host the whole network. Of course if you have more than one machine than you're screwed. Not saying it's impossible, but just a real pain for something that's supposed to "just work".

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