DHCP binding?

Hi all,

We recently installed SP2 on our DC's (Catching up with updates slowly).
These host AD, DNS and DHCP, since this and its subsequent reboots we have
been having lots of NACK messages logged in the DHCP log.

The servers are multihomed with 2 NICs, one is the HO lan (10.20.x.x) the
other is used for branch offices (10.160.x.x) (As they all link back to us
and use our DNS). There are several scopes on the DHCP server:

10.20.10.1 > 10.20.10.254
10.20.12.1 > 10.20.12.254

The error messages on the clients are the following:

The IP address lease 10.20.10.238 for the Network Card with network address
00A88BDD3A9E has been denied by the DHCP server 10.160.10.10 (The DHCP Server
sent a DHCPNACK message).

I thought this was a bit odd, because the reason for the nack is because the
DHCP server that answered is 10.160.10.10, does not have any scopes on its
address range to give, hence the nack (Is that correct?)

I have looked online for various information, and eventually found that in
the DHCP server options, the DHCP service is set to bind to both network
cards. I took out the 10.160 option and restarted the server and it appears
to be OK?? (Is this right?)

Microsofts documentation:

http://technet2.microsoft.com/window....mspx?mfr=true

Does not state if the DHCP service binds to both NIC's or just the first one
it can only (Which would explain my problem), can someone clarify this?

"UselessUser" <(E-Mail Removed)> wrote in message
news:08C638B3-027A-4FC4-A83A-(E-Mail Removed)...
> Hi all,
>
> We recently installed SP2 on our DC's (Catching up with updates slowly).
> These host AD, DNS and DHCP, since this and its subsequent reboots we have
> been having lots of NACK messages logged in the DHCP log.
>
> The servers are multihomed with 2 NICs, one is the HO lan (10.20.x.x) the

A very, very, very bad idea. DCs are supposed to stay single-homed with
one nic.

272294 - Active Directory Communication Fails on Multihomed Domain
Controllers
http://support.microsoft.com/default...b;en-us;272294

191611 - Symptoms of Multihomed Browsers
http://support.microsoft.com/default...b;EN-US;191611


> I thought this was a bit odd, because the reason for the nack is because
> the
> DHCP server that answered is 10.160.10.10, does not have any scopes on its
> address range to give, hence the nack (Is that correct?)

Most likely.

> I have looked online for various information, and eventually found that in
> the DHCP server options, the DHCP service is set to bind to both network
> cards. I took out the 10.160 option and restarted the server and it
> appears
> to be OK?? (Is this right?)

That should be fine.


--
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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