DHCP probs with multiple LAN subnets
Posted on 1997-03-10
I have two NT 4.0 servers running on the same physical ethernet. Both have DHCP servers enabled - one server handles subnet x.x.20 and the other handles x.x.21.
When a Win95 client boots and request DHCP addresses, both
servers attempt to offer an address. The client (correctly) tries the
first address offered, but when the client tries to claim the address
given by one the server, the other server NACKs it.
Example (from a ethenet trace):
Client --DHCP req.-->broadcast
ServerA-offer on subnet 20->Client
ServerB-offer on subnet 21->Client
Client--Attempt address offered by ServerA->ServerA
Unfortunately, the client sees the first NACK (from the wrong server!) and gives up on the attempted address, even though serverA attempts to ACK it.
Curiously, the DCHP transaction number NACKed by serverB wasn't even address to the serverB!
What am I doing wrong?