On one of my segments (172.22.0.0 with 255.255.0.0 as the mask) a DHCP
server started randomly assinging a wrong SubnetMask as part of the lease.
We have two DHCP servers on this segment each configured with different
scopes with in the above range.
We took the offending server down, uninstalled dhcp service, reapplied all
the service packs, run it for three weeks with out any DHCP, reinstalled the
service, reapplied the service packs, reconfigured the scope and options
etc. It ran for a while (about 10 days) without any problems.
Last week we started getting the proble agian. To make things worse, this
time around the other dhcp server started doing the same thing.
Both servers Compaq Proliant 1600 NT4.0 Server with SP6a. They randomly
give 8bit mask instead of 16 bit mask configured for the server.
If we release and renew on the clients everything is okay. A few hours later
another client will have this proble. This is totally random. I found only
this on mskb which is not of much help "Incorrect Subnet Mask and Options
Assigned from Windows NT 4.0 DHCP Server (Q261489)"
Any thoughts? Thanks.