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02.25.2008 at 09:40AM PST, ID: 23190891
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Running multiple DHCP scopes/servers
Tags: Microsoft, Windows Server 2003
Hi!

I have a network with 2 Active Directory domains.  Currently IP addresses are supplied to the network from one DHCP server.  What I need is for each domain to have its own DHCP server on the same physical network.  I'm doing ok until I get to the point where a client needs to be configured.

How do I tell a workstation (XP) which DHCP server on the network to use?  Or am I going about this the wrong way?  I've read a few articles on running multiple DHCP servers but I can't find this issue addressed anywhere.  They say I can (run multiple DHCP servers) but... how?

Thanks!
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Question Stats
Zone: Networking
Question Asked By: tomrwilson
Solution Provided By: bhnmi
Participating Experts: 2
Solution Grade: A
Views: 97
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02.25.2008 at 09:44AM PST, ID: 20977470

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02.25.2008 at 09:46AM PST, ID: 20977486

Rank: Guru

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02.25.2008 at 09:48AM PST, ID: 20977513

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02.25.2008 at 09:50AM PST, ID: 20977527

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02.25.2008 at 09:53AM PST, ID: 20977571

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02.25.2008 at 09:55AM PST, ID: 20977590

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02.25.2008 at 09:58AM PST, ID: 20977624

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02.25.2008 at 10:18AM PST, ID: 20977828

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02.25.2008 at 09:44AM PST, ID: 20977470
You need to segregate these domains to separate subnets.

You best bet would be to use VLANS if you have a layer 3 switch. It will make life much easier.

You cant tell a workstation what DHCP server to use, the work station does a broadcast and what ever server answers is the one that assigns the IP.
Accepted Solution
 
02.25.2008 at 09:46AM PST, ID: 20977486

Rank: Guru

Workstations find a DHCP server by sending broadcast requests out over the LAN, with an available DHCP server detecting the request and responding. To run separate DHCP servers and make sure workstations don't use the wrong one, the broadcast packets need to be blocked/restricted so they cannot pass to the wrong DHCP server.

A VLAN or running your networks off firewalled routers is probably the best method to do this.
 
02.25.2008 at 09:48AM PST, ID: 20977513
With VLAN's you can define an IP-Helper address. This relays the UDP broadcasts to a specified address. The DHCP server can then reply with the proper IP address for that subnet.
 
02.25.2008 at 09:50AM PST, ID: 20977527
Our firewall has an extra port not being used.  I could, say, assign 10.0.2.x to it and plug a switch into it?  Is this the right idear?
 
02.25.2008 at 09:53AM PST, ID: 20977571

Rank: Guru

Do the two networks need to communicate with each other? By plugging a separate switch into your firewall and ensuring the firewall doesn't allow communication, at least for the UDP broadcasts, between networks, this should work. A decent layer 3 switch would be much more effective though.
 
02.25.2008 at 09:55AM PST, ID: 20977590
"Do the two networks need to communicate with each other? "

Yes, trusts are fully enabled however cross domain traffic is mainly administrative.
 
02.25.2008 at 09:58AM PST, ID: 20977624

Rank: Guru

In that case this approach will work only if the firewall is configured to allow the ports with the two switches on to communicate with each other, but not transfer UDP packets between the two ports. However, unless you are sure this can be done with your firewall (something I can't assist with) a layer 3 switch with IP Helpers would be a much better route with regards to keeping complexity and administration to a minimum.
Assisted Solution
 
02.25.2008 at 10:18AM PST, ID: 20977828
Damn.

Thanks! :)
 
 
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