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Redundat DHCP accross two subnets

 
 
Jim Raykowski
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      04-11-2008, 05:17 PM
I have a client that has 150 desktops on two seperate subnets connected via
switches and no VLANS. On subnet 1, 10.10.1.1, there is a W2K3 Server as the
DC/GC/Pri DNS/DHCP for it subnet on subnet 2, 10.10.2.1 there is a W2K3
Server as GC/Sec DNS/DHCP for its subnet.
I would like to setup the dhcp servers to support the other subnet in case
of a server failure. Creating the scopes is not my question my questions are:

1. Do I need to bind an IP for both subnets on the dhcp server nics?
1. Do I need to install the dhcp relay agent on each server?

--
Jim

"Nothing is fool proof to a talented fool"
 
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Phillip Windell
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      04-11-2008, 06:06 PM
"Jim Raykowski" <(E-Mail Removed)> wrote in message
news:9E8DA42E-FDB1-4EEF-88E5-(E-Mail Removed)...
> I have a client that has 150 desktops on two seperate subnets connected
> via
> switches and no VLANS. On subnet 1, 10.10.1.1, there is a W2K3 Server as
> the
> DC/GC/Pri DNS/DHCP for it subnet on subnet 2, 10.10.2.1 there is a W2K3
> Server as GC/Sec DNS/DHCP for its subnet.
> I would like to setup the dhcp servers to support the other subnet in
> case
> of a server failure. Creating the scopes is not my question my questions
> are:
>
> 1. Do I need to bind an IP for both subnets on the dhcp server nics?


No.
Even if you did it would require and additional nic in each box.
And then even if you did you are not supposed to duel-home a Domain
Controller anyway.

> 1. Do I need to install the dhcp relay agent on each server?


No. Not even really sure what agent you are talking about, but the answer
is still "no" anyway.

The LAN Router that sits between the segments is what has to have the DHCP
Relay turned on. It is a function of the router,...not an agent. If the
router was not designed with the feature as one of its abilities then you
are screwed, and will need a new router.

So it the end all you do on the DHCP is create the Scopes (No Superscopes!)
and set the Exclusions to keep the two servers from overlaping the
addresses. All the rest of the "work" is completely performed by the LAN
Router.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
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