Receiving DHCP from Domain Controllers

We have setup two domain controller.  Suppose we configure the Primary Domain Controller a DHCP scope of 192.168.101.100 to 192.168.101.175 and a Backup Domain Controller a DHCP scope of 192.168.101.176 to 192.168.101.250, if the first scope of addresses on the PDC are leased out, will a  client receive and address from the BDC.
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Zoldy2000Asked:
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chikenheadCommented:
yes
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chikenheadCommented:
Lets remeber that this is AD and not NT there are no BDCs and PDCs all DCs are equal masters  (in 2000 and 2003)  DHCP responds to broadcasts on the network.  What will happen in your scenario is that both DHCP servers will handle client requests.  There will be no guarantee of which server responds to which clients' requests.
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Zoldy2000Author Commented:
just to clarify...   each server responds to client requests and we can not predict we one will respond.   This is fine...   what I need to clarify is that if one of the servers is full...  all addresses are leased and a client requests an address will it automatically be redirected?  or whatever the term may be to get an address from the other server?
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jasonwebb2006Commented:
In order for this to work correctly, on each of the DHCP servers you need to exclude the range of the other. For example: Server1's DHCP range is 192.168.0.1-99 and server2's is 192.168.0.100-159. You need to exclude the range 100-159 on server1 and exclude the range 1-99 on server 2. This will ensure that your DHCP does not assign conflicting addresses. This will ensure that your entire scope on both servers is available. If one server runs out of free addresses, the other will lease it.
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ryansotoCommented:
One DC1 your scope runs out at 175.  When this scope is full yes the other scope 176-250 will start handing out addresses.

But server 1 wont necessarily hand out all addresses first.  It depends which server answers.
As long as you have 2 scopes you will be fine if one runs full.
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Zoldy2000Author Commented:
i don't necessarily care which one hands out the addresses first.   I just want to make sure if one is all leased out the other will respond.

thanks
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Zoldy2000Author Commented:
your exclusion example would not work as you can not exlude address not part of the scope..

in other words if my range is 0 -99
I can not exclude 100-150

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jasonwebb2006Commented:
That was just an example of how you can divide up your scope onto two different DHCP servers.
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Windows Server 2003

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