yup, sorry, ifconfig is for linux, ipconfig for windows.
rest is still true.
the reason i want to see his /all output is to compare his and his friends setup. also to look at his friends subnet and gateway. a lot of ISPs are giving out ROUTERS and calling them MODEMs. the issue with this is they are locked into an IP scheme the prevents more then 1 connection of any kind so even a router behind it with NAT is worthless.
if that is the case, only 1 of the 2 computers can be online at a time.
also as for the release/renew when he boots up, or restarts those happen automatically for win2k and newer OSs. win9x sometimes had major issues with this but still a reboot "should" resolve the issue unless he is under a static IP, then /release /renew and reboots will NEVER work.
still waiting on a response to the questions, we need more info to really help.