This just started yesterday afternoon, and so far has only turned up twice
but...

DHCP runs on clustered servers. By default it runs on 10.1.10.2, if that
server goes down, the clustered server at 10.1.10.1 will pick up the
service and run with it.

Those same two servers happen to be the DNS servers. DHCP has been
configured to give out the DNS server addresses.

For some reason in the middle of the day my workstation suddenly can't get
to the internet (but everyone else can) and when I look at ipconfig /all,
my DNS server is set to 10.10.1.1 (go figure...there's no server on my
network by that number). If I do a release and renew, I get the 2 correct
servers back for DNS 10.1.10.1 and 10.1.10.2, and I can go on about my
business. In both cases the DHCP server was 10.1.10.2...it's not like the
service failed over at some point...

Netware 6.5 sp4a on servers, going to sp5 this weekend. Workstation is
XPsp2....