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
Read the original article Hit count: 1191

Filed under:

dhcp

|

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?

© Server Fault or respective owner

Related posts about dhcp

nokia cell phone not accepting IP from dnsmasq dhcp server

as seen on Server Fault - Search for 'Server Fault'
Hello, I having problem connecting a NOkia cell phone to my home wifi network. The wifi network is provided by a wireless card in a machine running Debian Testing and 2.6.26-2-686 kernel. The cars is D-Link DWL-G520 working in ap mode and has WPA encryption enabled. The wireless network is provided… >>> More
dhcp-snooping option 82 drops valid dhcp requests on 2610 series Procurve switches

as seen on Server Fault - Search for 'Server Fault'
We are slowly starting to implement dhcp-snooping on our HP ProCurve 2610 series switches, all running the R.11.72 firmware. I'm seeing some strange behavior where dhcp-request or dhcp-renew packets are dropped when originating from "downstream" switches due "untrusted relay information from client"… >>> More
Windows Vista DHCP bug, arp authorize, isc dhcp, workaround

as seen on Server Fault - Search for 'Server Fault'
I am trying to find a workaround for the Windows Vista Force Broadcast bug with ISC DHCP and a Cisco Router. The problem is not windows vista trying to obtain an IP address from us that works fine (with or without the flag enabled). THe problem is we are using a cisco router and the command 'arp… >>> More
DHCP Relay V DHCP Local Cisco v 3com

as seen on Server Fault - Search for 'Server Fault'
Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp… >>> More
DHCP Relay V DHCP Local Cisoc v 3com

as seen on Server Fault - Search for 'Server Fault'
Howdy, I have a client who has a WAN with 7 sites. At one site in particular, randomly about 4-5 clients do not get an IP address. The local gateway is a cisco 871 and relay's to a windows server in a Data Center running a valid scope for the subnet. If I put in a cisco 1800 and configure a dhcp… >>> More

Related posts about windows-server-2008-r2

Cannot enable network discovery on Windows Server 2008 R2

as seen on Server Fault - Search for 'Server Fault'
I'm trying to enable the Network Discovery feature on a newly installed Windows Server 2008 R2 instance. The network connection is in the Home or Work profile (it is not domain joined). These are the steps I've followed: Within the Network and Sharing Center I select Change advanced sharing settings Then… >>> More
Windows Server 2008 R2: AD Module for Windows PowerShell

as seen on Internet.com - Search for 'Internet.com'
Windows Server 2008 R2 includes a new Active Directory module for Windows PowerShell, a consolidated group of 76 cmdlets that can perform a host of tasks against Active Directory's various services. >>> More
Windows Server 2008 R2: Introducing the AD Administrative Center

as seen on Internet.com - Search for 'Internet.com'
The Active Directory Administrative Center in Windows Server 2008 R2 is a significant improvement over its predecessor. Although not without limitations, it offers beefed-up management of AD objects, new navigation capabilities, better task-based management options, and improvements to the properties… >>> More
Sun Fire X4270 M3 SAP Enhancement Package 4 for SAP ERP 6.0 (Unicode) Two-Tier Standard Sales and Distribution (SD) Benchmark

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Oracle's Sun Fire X4270 M3 server achieved 8,320 SAP SD Benchmark users running SAP enhancement package 4 for SAP ERP 6.0 with unicode software using Oracle Database 11g and Oracle Solaris 10. The Sun Fire X4270 M3 server using Oracle Database 11g and Oracle Solaris 10… >>> More
Now Customers Can Actually Locate Your Resources with URL Rewriter 2.0 RTW

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Today, Microsoft announced the final release of IIS URL Rewriter 2.0 RTW . Now the first reason might be obvious why you would want to rewrite a URL – when you are at a cocktail party with loud music and tasty appetizers and a potential customer asks you where they can get more info on your snazzy… >>> More