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Redundant DHCP Server Setup on Windows 2003 Network

I have Windows SBS 2003 and I have a member Windows 2003 server.  I have setup active directory on both servers (with SBS being primary of course) and also setup my member 2003 server to be a secondary DNS server.  I have two subnets for two virtual lans that SBS 2003 server acts as a DHCP server for.  

My question is how can I setup a redundant DHCP server on my 2003 member server in the event that my main server goes down.  I ask this because this recently happened and it created mass chaos for the client computers. From what I understand, SBS won't allow more than 1 DHCP server on the network.  Some people have said to setup two DHCP servers to dish out different ranges on the same subnet, but this won't work according to what I have heard from others since SBS supposedly has this 1 DHCP server limitation.

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NJComputerNetworks
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Add the DHCP service on the second machine... authorize it.  setup two DHCP servers to dish out different ranges on the same subnet.  Just make sure these don't overlap.
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benbecker

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When you say to authorize it, how is this done?  Also, will SBS allow more than 1 DHCP server on the network?  is that what authorizing will do?

Also on my member server, i added the server role of active directory, it had me go through a wizard and reboot, I am assuming I am good to go on the active directory side.  I also checked the global catalogue option as well, so I think I'm good there.  I just need redundant DHCP so I don't have to touch my clients in time of disaster.  Last time I was scrambling around assigning static IPs and messing with a bunch of piddly things that wasted my cycles that could have been sent assessing the disaster.  I'm trying to avoid this with the redundant DHCP.
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Steve, I think we're all set and I can't agree with you more about how dumb it is that W2k and above go out to get a new IP on the reboot.  I was able to authorize the second DHCP server and used the 80/20 rule to setup the exlcusion ranges and everything seems to be functioning.  We unplugged and our main server from the network and did a test and it looks like my backup domain controller, dns and dhcp server kicked in.  We did notice that logging in did seem to take longer than usual, but at least we didn't get the dreaded no domain controllers can be reached issue.

Thanks a ton for the help!