You have 2 DHCP servers on the same subnet??? This is probably not a good
idea... it does not really provide redundancy or load balancing.
The DHCP client will issue a request and accept the first response that it
gets.
If you split your scope such that half of your available addresses are on
one server and half are on the other, you will *NOT* see that half of your
clients use one server while half use the other. If for some reason one
server always replies a nanosecond earlier than the other, then all clients
will accept the response from that server. Once that server is out of
addresses, it will start sending nack's. The clients will start accepting
those nack's and will not request an address again, even though the other
DHCP server may have dozens of free addresses to offer.
SO - in answer to your question, the ip helper address of 10.10.10.0 will
allow your client's requests to reach all DHCP servers on that subnet,
HOWEVER they will only accept leases from the first server from which they
receive a response. Chances are that server will be the same one all the
time, even after it runs out of addresses to offer...
You *could* set up your DHCP servers such that the scope on EACH ONE is
sufficient to offer leases to ALL of you clients, but that is probably a
less than efficient use of your address space.
I hope that this helps...
Dale
[=`)
>From: "Dennis Bates" <[EMAIL PROTECTED]>
>Reply-To: "Dennis Bates" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Ip helper address
>Date: Fri, 8 Sep 2000 08:10:44 -0500
>
>I am trying to put a statement on the remote router to allow the clients to
>obtain an IP address accross the WAN. I have used the ip helper-address
>command successfully. My problem is that i would like any of the DHCP
>servers at the central site to be able to service DHCP requests from the
>remote site. Do I have to use mutilple ip helper-address statements ? I
>have tried a helper address pointing to the subnet, but that does not seem
>to work. EX. i have DHCP servers at 10.10.10.10 and 10.10.10.11 do i have
>to
>use two seperate ip helper address statements or can i use ip
>helper-address
>10.10.10.0 ?
>
>
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