I have a small home network of 2 Win2K and one WinXP Home systems, connecting via ISDN to the internet. The home network is Static IP based, using TCP/IP
Net BIOS is enabled over tcp/ip so that the shares between the machines work properly. DNS is not set on any machine and all three systems have Windows Update disabled, are set to not register their connections with DNS.
At random intervals, the gateway system dials the Internet, sometimes only once, but sometime repeatedly. no single action on any system seems to trigger the event and no consistent pattern is observable.
A packet sniffer is not showing anything unusual.
The ISDN automatically assigns DNS etc on connection. I have had to disconnect the ISDN from the socket as the last time it dialled, it did not auto-disconnect as it is set to do and stayed connected for almost 12 hours.
Any ideas how to track down the culprit