Re: DHCP client receving address from one server and scope options from another

When a client boots up, it broadcasts on the network to get its config
from a DHCP server. The DHCP server replies with an offer.

In addition, a client can send a DHCPINFORM message (after it gets its
initial config) to receive additional information from a DHCP server. This
info may come from a different source. As an example, a remote client might
get its original config from a remote access server, then obtain additional
LAN-based settings from the DHCP server on the LAN using DHCPINFORM.

usenetposter2006@xxxxxxxx wrote:
I am having trouble understanding something that is occuring on one of
my client computers. I am in the process of bringing a new Windows
2003 R2 DC online to replace an old Windows 2000 DC. Both servers are
running DHCP (with non-overlapping scopes), DNS, WINS. There is
another Windows 2000 server on the same network offering the same
services. My previous setup is as follows:

All DHCP servers have non-overlapping scopes and each scope provides
scope options to point DHCP clients to DNS and WINS servers. When a
DHCP server offers a client an address, the options that it sends
always list the DHCP server as the primary server for DNS and WINS.
So for example, Server A gives out an address and the DNS options for
it would be Server A as the primary, and Server B as the secondary.
This has always worked without any problems. With the addition of
the new server I am seeing some very strange behaviour. In
particular, one client is getting a DHCP address from Server C (the
new server), but it's getting it's DNS scope options from Server B.
The WINS scope options on the other hand are coming from Server C as
they should be.

If I release and renew the IP address on the affected client, it gets
all of the proper settings. It gets all scope options from Server C.
But, a few minutes later (5-15) when I check the client using IPCONFIG
/ALL, the DNS options have changed to those offered by Server B.

Does anyone have any insight into why this is happening, or any
suggestions for how I would troubleshoot? There are no errors in the
event logs on the clients or servers, and dns resolution on all
servers seems to be working fine when checked with NSLOOKUP.

Thanks,
Troy.


.

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