Just thought I'd share a recent experience helping a friend out with his home network. This guy had ADSL installed for a home network with two PCs connected via an ADSL router modem (with a built-in firewall). Everything worked fine. He then started complaining that every morning none of the computers were able to access the internet without restarting. I suggested simply switching the PCs off overnight, but he preferred to leave them on. He then tried changing ADSL routers but still had the same problem. I concluded that the ISP must be disconnecting after a period of inactivity until I noticed he was running Zonealarm, and asked him to disable it. That solved the problem, but I thought I'd share it in case anyone has similar problems.