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Running 2 DHCP Servers (W2K, W2K3) on same network

Posted on 2004-04-15
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Last Modified: 2008-05-30
Hello,

I am trying to find some documententation which will confirm what is possible for running 2 Windows 2K/2K3 DHCP servers on the same network.

I tried to setup and run two DHCP servers, one on a domain controller (2k), the other on a 2k3 member server. Their scopes did not overlap, but one of them stopped itself because it detected another DHCP server running. Unfortunately, I cannot give you the prescise error/event id, because someone cleared the event logs without saving them (handy).

Im really just looking for a document (micorsoft preferred), which says what you can and can't do with multiple DHCP servers.

My suspicion at this point is that it didn't work properly because the 2K3 server wansn't a domain controller. Just a guess.
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Question by:jonoAtwork
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by:haresh-nyc
ID: 10838736
hi,

can't give you a document link just yet,
but I can tell you you can't have two dhcp servers on the same cable segment.
DHCP works on the principal of broadcast, and they will both conflict.

There is no issue of needing a DC or stand alone, it's a broadcast issue and both are broadcasting on the same cable segment.

You cannot run two dchp servers that are in the same "broadcast domain"
Don't want to get all ccnp techie, but that means even with ethernet switches, you can't do this.

THE ONLY way to have two dhcp servers is if they are separated by a ROUTER.
(a router can even be a pc with two nics, but they must each be connected separately to different hubs/switches).

I would recommed checking cisco.com for "dhcp" and "broadcast domain"
if you want a true deep understanding of this.
Cisco.com has one of the best tech support articles on the planet.

haresh
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Author Comment

by:jonoAtwork
ID: 10838759
If only the event logs wern't deleted. I recall it described a similar scenario as you describe. I need a document (preferably from Microsoft), which explains their position on the issue. I guess the simple method would be to simple turn both of them on and wait for the error to occur again. :)
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Expert Comment

by:skwiggley
ID: 10838830
I looked around the Microsoft Support site and found these articles that may be relevant to you. The first one specifies an Event Log message, the others are more general.

Event ID 1003 and DHCP Client Denied with Two DHCP Servers on the Network
http://support.microsoft.com/default.aspx?scid=kb;en-us;244978

The DHCP Client May Not Work with Two DHCP Servers
http://support.microsoft.com/default.aspx?scid=kb;en-us;287021

DHCP Client Has Leases on Multiple DHCP Servers
http://support.microsoft.com/default.aspx?scid=kb;en-us;268833

Dynamic Host Configuration Protocol Server Management Console Issues in Windows 2000
http://support.microsoft.com/default.aspx?scid=kb;en-us;296630

Hope this helps!
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Expert Comment

by:haresh-nyc
ID: 10839134
hi again,
I found a fantastic article.

it even explains how you can run two dhcp servers.

http://www.microsoft.com/resources/documentation/windows/2000/server/reskit/en-us/tcpip/part2/tcpch04.mspx

this is the actual article I printed out for a class I taught in advanced network troubleshooting.

haresh
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Accepted Solution

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haresh-nyc earned 125 total points
ID: 10839148
hi again,

here's the Printer friendly version of the above link:
it won't open in frames like most of m$ pages are.

http://www.microsoft.com/resources/documentation/windows/2000/server/reskit/en-us/tcpip/part2/tcpch04.mspx?pf=true

haresh
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Author Comment

by:jonoAtwork
ID: 10839268
Excellent document. Looks like you can have 2 servers running at the same time, they recommend using the 80/20 rule.

I think my second DHCP server was not authorized to start, or AD hadn't updated yet.

Thank you sir
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Author Comment

by:jonoAtwork
ID: 10839445
Ahaaaaaa!

It's SBS! The following event log is logged when I try to start the DHCP server on the SBS box when the other DHCP server is running.

The DHCP/BINL service on this Small Business Server has encountered another server on this network with the IP Address, 192.168.0.5, belonging to the domain: .

Its default action is then to SHUTDOWN, which makes little sense to me. Strange though, the the SBS Box is a PDC, and it will accept other non-SBS boxes as DHCP servers.

SBS, without a doubt, sucks.
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