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By beaudoin ·
We currently have 2 servers running Windows 2003, serving as DNS servers, replicating with each other. We're about to impliment DHCP on these same servers, but I'm unable to find anything regarding replication for that database. Does it exist for DHCP, or should I look at splitting my zones (i.e. 70-30)?

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by timwalsh In reply to DHCP

There is no replication of DHCP databases when using multiple DHCP servers. Multiple DHCP servers cannot offer the same or have overlapping IP address ranges.

I'm assuming you are attempting to provide some fault-tolerance for DHCP where one DHCP server can service your domain if the other fails (vs. attempting some form of load balancing).

Assuming that both DHCP servers are co-located, there is no guarentee which DHCP server will answer client requests. Therefore, the actual percentage of available IP addresses assigned to each DHCP server doesn't matter as long as the size of the each scope is sufficient to service your entire domain.

If the number of clients to be serviced exceeds more than half of the available IP addresses, true fault-tolerence doesn't exist because in the event of loss of one DHCP server, the other has an insufficient number of addresses available to service all clients. While you can always change the size of the scope on the remaining DHCP server, until you do so, some clients will be unable to receive IP addresses (not good if the boss decides to come in late that day).

Hope this helps.

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by beaudoin In reply to

Thank you. This makes perfect sense. I couldn't find anywhere that explained it like that.
Thanks again.

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by beaudoin In reply to DHCP

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