Solved

Win2k8 DHCP - multihomed NIC

Posted on 2010-08-15
4
669 Views
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?

0
Comment
Question by:blakogre
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 59

Accepted Solution

by:
Darius Ghassem earned 250 total points
ID: 33441753
0
 
LVL 3

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
0
 
LVL 9

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.
0
 
LVL 9

Author Comment

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.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We recently had an issue where out of nowhere, end users started indicating that their logins to our terminal server were just showing a "blank screen." After checking the usual suspects -- profiles, shell=explorer.exe in the registry, userinit.exe,…
Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…
This tutorial will walk an individual through configuring a drive on a Windows Server 2008 to perform shadow copies in order to quickly recover deleted files and folders. Click on Start and then select Computer to view the available drives on the se…

733 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question