This might be the fix (not for beginners) you're thinking of:
http://www.gnutellaforums.com/showth...843#post196843

If that's not the one, it's probably somewhere within this sticky, there's a fair bit of info about routers if you scroll down the page a bit
Connection problems? Check here first!

I'm not normally using the XP firewall but I just turned it on & checked the firewall config thingy...mine retains the IP 127.0.0.1. I think other people have also had the issue where it reverts back to their computer's name but I'm not sure if it's anything to be concerned about or not
Use the forum search to see if you can find any info, otherwise I'll have a look around later on & see what turns up