Armando, >> Michel Py wrote: >> I'm not arguing about that, it is delaying things indeed. >> However I wonder which kind of instant messaging you are >> referring to, as all the ones I've seen work fine through NAT. > Armando L. Caro Jr. > Yahoo and AOL (I have never used MSN). Sure, you can do > normal chatting, but once you extend into the other > features such as file transfer, voice, and webcam... > things break. In many enterprise environments, this would be a feature not a bug. There are some webcams that are definitely inappropriate in a business setup; given the lack of good enterprise content filtering solutions for IM, if NAT does break IM webcams I don't have a problem with it. As of file transfer, it does not bother me either as like a lot of other network administrators I have a problem with users sharing their office computer files with anyone unknown on the net. For voice there's always that thing called the telephone that has the advantage to work all the time with anybody and can be logged. Michel.