I have a dilemma when it comes to running two dhcp servers on the same subnet.
I have one Small Business Server 2003 and one Server 2008 and would like/have two DHCP servers Server01 and Server02 for fault tolerance.
SBS server (Server01) is connected to T1 and Server2008 (Server02) is connected to DSL and is the backup in case Server01 fails.
I have the IP ranges A B C D autorized on both DHCP servers with A B excluded on Server02 and C D excluded on Server01. Both are on the same subnet.
If I start the DHCP on Server01 and then start the DHCP on Server02, everything works fine and if Server01 gets shut down, Server02 takes over the clients.
Now the problem is that if I have the DHCP running on Server02 and then try to start the DHCP on Server01 (which as I mentioned above is the SBS server), DHCP on Server01 fails to start because it sees that there is already a DHCP server on the network.
I have read that if you have two DHCP servers running, one shuts down, but I have also read that you can have two DHCP server on the same subnet.
What is correct?
Why am I having the problem when I first start Server02 and then Server01, but not the other way around?
Any clarification would be appreciated.
Remy
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