I suggest disabling Dhcp on router and setting it up on your server
Setting up a DHCP server in Windows 2003
Configuring DHCP on Windows Server 2003
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Question
DHCP Failing
Here is the setup, Windows 2003 running AD and DNS, Linksys router acting as the DHCP server, Versizon DSL, DSL modem is a telephony Cisco 1700 series model, 12 client machines. The problem is that all the client machines are not getting IP's assigned to them. IP's are not even being autoassigned, they are all coming out to "0.0.0.0".
If I staticly assign IP's to the machines, everything is OK, internet, network resources the works. As soon as I change it back to "Get IP Automatically", it goes back to "0.0.0.0". I checked the configuration of the router and it is all correct. Thinking that something has gone wrong with the router, I got a new one, configured it properly and the same thing happened.
Tonight, I bought a new switch, going to swap that out tomorrow, see if the switch is loosing packets somehow.
Any thoughts?
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Answers
Thanks ChiefIT,
I did not know that there was such a tool as DHCPloc.exe. I downloaded it and found out that someone (and I know who it is) hooked up an old Windows 2000 server to the network without my or anyone elses knowledge. And of course it was configured as a DHCP server. As soon as I pulled the plug on the 2000 server, everything started working just fine.
Thanks again to all!
OK, so I understand DHCP is on the server, and not the router.
Let me explain the problem with the router, so you can understand my concern. A router supplying DHCP usually defaults to supplying DNS. However, the router will not support the DNS SRV records for the servers. SRV records are used to locate the domain controller for authentication and other functions. So, if the router is supplying DHCP, you may end up having issues with clients not able to logon to the server or find the server.
A router will also act as a rogue DHCP server and can easily knock down your server's ability to supply DHCP.
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by: ChiefITPosted on 2009-03-24 at 19:48:05ID: 23975669
Let's start simple:
Did you authorize it as a DHCP server?
Can you download DHCPloc.exe and see if you have a rogue DHCP server?
Do you use ISA firewall or windows firewalls? Some firewalls block DHCP.