|First off I am a power user and there is rarely a problem I cannot fix, so you can probably reserve any Tier 1 type fixes.|
3 Desktops all running Windows XP SP3
2 of them are HP Pavilions, mine is custom built with ASUS mobo
I've been through 6 different routers of 3 different brands and styles, because it SEEMS like a router issue but it simply cannot be after that many replacements.
Usually we have these 3 IP addy's:
When everything is fine, the default gateway is 192.168.1.1
At random moments ranging from an hour to a week, one of the computers will suddenly have a new default gateway. It is usually something strange and last time it was 126.96.36.199
When this happens the PC with the bad gateway cannot access the interent, but can ping all other computers on the network at <1ms each. However, if you ping it from another PC on the network its a bit high like 10-13ms
The way I "fix" it is by doing 'ipconfig /release' on each machine, unplugging all cables from the router, power cycling the router and connecting 1 PC at a time in the order of which we need internet access the most. (because sometimes only 2 can connect)
This problem does not occur when only 2 PCs are connected to the router.
I have disabled wireless for the purposes of troubleshooting and it still happens.
I have heard of this problem with Vista specifically, and in that case there is a registry fix related to DHCP / router interactions. I have not heard of it with XP.'
Also, please note this can happen at ANY time. Since it doesn't just happen when turning 1 machine on/off or release/new or plug/unplug cables that may rule out some simpler issues.