[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

DHCP Server not leasing IPs.

Posted on 2013-05-21
6
Medium Priority
?
1,022 Views
Last Modified: 2013-08-03
Hi,

I have two Windows server 2012 VMs that are DC and DNS servers. I set up DHCP on one with scope and configured fail over to the other VM that is also a DC and DNS server on another HYPER-V host.

After 3 weeks or so, they stopped leasing IP address. There where no errors and warning in either event Logs. Reboots etc.. made to difference.

In the end I had to put DHCP on a 2003 Server and have that leasing out the IPs.

TROUBLESHOOTING;
I removed the role on both 2012 servers and rebooted. I then added the role on DHCP01 and saw that the scope database was still intact with exclusion, reservations etc.. I did not set back up the failover. I unauthorised the 2003 and authorised the 2012. All was fine for two hours or so and again no IPs. Back to 2003. In event logs there was database backup issues for DHCP. Forums stated AV and to exclude the DHCP folder. that was there already but stopped AV anyway. Switched back off 2003 and back on 2012, but the same after a while with no event logs.

I then 'moved' the role from DHCP01 to the other 2012 server, DHCP02, but the same would happen after a few hours with no errors.

The DHCP01 VM and DHCP02 VM are on different Hyper-V Hosts.

What can cause this to happen? I have other customers with server 2012 DHCP server with no issues.?

-Thanks,

GNS.
0
Comment
Question by:ggntt
[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
  • 4
  • 2
6 Comments
 
LVL 24

Expert Comment

by:Nagendra Pratap Singh
ID: 39186499
During that time, did you install a new firewall etc?

Also do you have a spare 2012 VM where you can install DHCP and some packet analyzer?
0
 

Author Comment

by:ggntt
ID: 39189010
Hi npsingh123,

No new firewall at all.

I have the two host servers!


-GNS!
0
 
LVL 24

Expert Comment

by:Nagendra Pratap Singh
ID: 39189807
Create a small vm and install dhcp + packet analyzer on it.

Installing on host will not work because it has different settings.

Few from the following page may be good for windows 2012.


http://4sysops.com/archives/free-packet-sniffers-for-windows/

This has the process

http://www.youtube.com/watch?v=WztEbO0uiiQ
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:ggntt
ID: 39201461
Hi All,

An update.
I Installed a new Win2012 VM and added the DHCP role. THen with wireshark and followig the link from npsingh123, it was leasing out IPs and the other server was not. However after 2 hours it was still going strong and after 3.5 hours still was leasing IPs. ( other time it stopped after 2 hours ish) I then started to add in a deny list of all the mobiles phones that access the network via WAPs, and within an hour of activating the deny list, the server stopped leasing IPs. I then disabled "Deny" and all is working again.

Any ideas?

Thanks,

-GNS
0
 

Accepted Solution

by:
ggntt earned 0 total points
ID: 39363342
The answer was that the filter option had the Deny all but the list ticked, with nothing in the list. Once that was unticked, all was good again.
0
 

Author Closing Comment

by:ggntt
ID: 39378819
The answer was that the filter option had the Deny all but the list ticked, with nothing in the list. Once that was unticked, all was good again.
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

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

Learn how to PXE Boot both BIOS & UEFI machines with DHCP Policies and Custom Vendor Classes
August and September have been big months for VMware—from VMworld last month to our new Course of the Month in VMware Professional - Data Center Virtualization. We reached out to Andrew Hancock, resident VMware vExpert, to have a more in-depth discu…
In this Micro Tutorial viewers will learn how to use Windows Server Backup to create full image of their system. Tutorial shows how to install Windows Server Backup Feature on Windows 2012R2 and how to configure scheduled Bare Metal Recovery backup.…
In this Micro Tutorial viewers will learn how to restore single file or folder from Bare Metal backup image of their system. Tutorial shows how to restore files and folders from system backup. Often it is not needed to restore entire system when onl…

649 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