Hi everyone, I discovered that apparently certain IMs (Skype, perhaps WLM) broadcast your IP as soon as you connect to their service. [IRC is a different story altogether]. Until ISP-level upload speed caps are introduced, this poses a fatal security risk, as everyone who gets a hold of your (unchangeable, undeletable) username can instantly start a knockout* attack. The question is, are there any IMs that do not give away your IP to everyone on the internet? It is completely acceptable if they give out the IP when you attempt (initiate, start) a voice or video chat, which essentially is P2P or P2P + hub. It would be kind of acceptable if an IM would give away your IP without asking when transferring a file. However, it is absolutely not acceptable to have this automatically or during text chat. * – there are no services to be denied P.S. Sorry if this thread doesn't exactly fit into this forum (more about security than networking).