Windows 2008 R2 DHCP server not responding to DHCP discover

Posted by MartinSteel on Server Fault See other posts from Server Fault or by MartinSteel
Published on 2010-05-28T11:32:00Z Indexed on 2010/05/28 11:42 UTC
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dhcp

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windows-server-2008-r2

I've got two Windows 2008 Enterprise R2 servers both running DNS and DHCP called cod & lobster. DHCP is setup using the split scope option introduced with 2008 R2, whereby both servers should respond with the first response providing the lease. Setup is as follows:

Cod
- IP: 192.168.0.231
- Pool: 192.168.0.101 - 192.168.0.179, exclusion for 160-179.
- Response Delay: 0ms
- Authorised in Active Directory (Re-authorised to confirm) - Windows firewall disabled while testing

Lobster
- IP: 192.168.0.232
- Pool: 192.168.0.101 - 192.168.0.179, exclusion for 101-159.
- Response Delay: 1000ms
- Authorised in Active Directory

All DHCP leases to clients are currently being issues by Lobster rather than Cod. Packet captures with Wireshark show the following (all to broadcast address):

Client - DHCP Discover
Lobster - DHCP Offer (after 1s delay) Client - DHCP Request Lobster - DHCP Ack Client - DHCP Inform

From my setup with two servers I'd expect to see a DHCP Offer coming from Cod almost immediately after the DHCP Discover.

Does anybody have any idea what would prevent the DHCP Server responding to the discover?

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