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Win2k8 DHCP - multihomed NIC

Posted on 2010-08-15
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Last Modified: 2012-05-10
I have a server, with 2 IPs on one NIC, one is 192.168, the other is 172.16.  It's gateway is 192.168.0.1 -- dedicated to this server.  All other clients go out 172.16.0.1.

DHCP is configured with a 172.16 scope for the other clients.  However, no one is getting an IP, even though the server sees the broadcasts (per dhcp stats).

The 'bindings' show 192.168.0.x, the IP of the server.  There is nothing showing the 2nd IP bound to the nic of 172.16.

(All clients can access the server just fine)

How can I get the DHCP server to hand out IPs to the 2nd subnet?

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Question by:blakogre
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Accepted Solution

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Darius Ghassem earned 250 total points
ID: 33441753
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Expert Comment

by:rem1010
ID: 33441768
First question is why use two subnets on the same NIC?
It appears that you have a situation that is far more complex than it should be.
To achieve what it appears you want to do, you need TWO NIC cards.
One for the server to connect to the internet/router and the other for all the other clients.
You then either setup NAT on the server on the client side ONLY

The manner in which you have described, means that anyone who can access the network setup on their pc, can change to an ip that will let them get out to the internet by using the same subnet as the server, this is a bad idea.

There can ONLY be ONE DHCP server on a network, as the clients boot up and ask for an IP.

Usually the server has a fixed IP and the clients have a dynamic one.

Turn off ON of the DHCP servers and the clients will get an ip when they ask for it.

I hope this helps
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Author Closing Comment

by:blakogre
ID: 33441777
Weird.  Seems to be working.  thanks

@rem1010: it's a moderately complex setup.  No, 2 nic's aren't needed, as the previous answer resolved.  There's not enough traffic to even come close to justifying it.
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by:blakogre
ID: 33441792
@rem1010: one dhcp server?  We often use 2 with exclusions for redundancy.  When does a DHCP server *not* have a fixed IP?  And no, they can't change to static and go out a different gateway.  That's pretty darn easy to stop with a FW rule.
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