Re: ,So there's an online fix for not being able to get online?
Microsoft have never been that great at DHCP. There was a feature of the way Win2000 and I think some other versions cached DHCP leases between reboots which caused us problems with our high availability cross site DHCP setup.
I forget the details, but I *think* it was something to do with the machine preserving a lease between reboots and refusing to allocate an IP address if it couldn't contact that particular DHCP server even if there was DHCP active on another IP address. If I recall correctly it meant that if a server had to be taken down for maintenance then clients rebooted with an active lease would fail to get an IP address, but clients rebooted that had no cached lease would work just fine.
Once we were able to cluster DHCP on a single IP address it became much less of a problem, but it seemed plain dumb that DHCP forwarding as per RFC lets you specify multiple servers for resilience but Microsoft's caching effectively broke or at least bent that resilience.
Biting the hand that feeds IT
