Solved

Win2k8 DHCP - multihomed NIC

Posted on 2010-08-15
4
671 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

Comprehensive Backup Solutions for Microsoft

Acronis protects the complete Microsoft technology stack: Windows Server, Windows PC, laptop and Surface data; Microsoft business applications; Microsoft Hyper-V; Azure VMs; Microsoft Windows Server 2016; Microsoft Exchange 2016 and SQL Server 2016.

Question has a verified solution.

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

Scenario:  You do full backups to a internal hard drive in either product (SBS or Server 2008).  All goes well for a very long time.  One day, backups begin to fail with a message that the disk is full.  Your disk contains many, many more backups th…
A procedure for exporting installed hotfix details of remote computers using powershell
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…
This tutorial will show how to configure a new Backup Exec 2012 server and move an existing database to that server with the use of the BEUtility. Install Backup Exec 2012 on the new server and apply all of the latest hotfixes and service packs. The…

688 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