Solved

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

Posted on 2004-04-15
7
2,020 Views
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.
0
Comment
Question by:jonoAtwork
  • 3
  • 3
7 Comments
 
LVL 3

Expert Comment

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
0
 

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. :)
0
 

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!
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 3

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
0
 
LVL 3

Accepted Solution

by:
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
0
 

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
0
 

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.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Disabling the Directory Sync Service Account in Office 365 will stop directory synchronization from working.
Last week, our Skyport webinar on “How to secure your Active Directory” (https://www.experts-exchange.com/videos/5810/Webinar-Is-Your-Active-Directory-as-Secure-as-You-Think.html) provided 218 attendees with a step-by-step guide for identifying Acti…
This Micro Tutorial hows how you can integrate  Mac OSX to a Windows Active Directory Domain. Apple has made it easy to allow users to bind their macs to a windows domain with relative ease. The following video show how to bind OSX Mavericks to …
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question