DHCP Server guest on Hyper-V 2012 R2

[Alis_Klar]

Hi,

 

I am currently testing the option of using p2v to migrate our existing Win Srv 2003 R2 DHCP server on to hyper-v 2012.

 

The 2003 guest is also a Domain controller and SIMS server (i am aware of the issues in virtualising a DC). Everything is working as it should on the virtualised server except the DHCP server.

 

Can anyone think of a reason why it wont work. Clients report that they cannot contact a DHCP server. The old physical server is still working but I have pulled out the network cable so there are not 2 DHCP servers on the network.

 

Initially the DHCP server on the VM was not authorized so I authorized it.

DHCP guarding is disabled in the virtual NIC setting for the VM in hyper-v

[Alis_Klar]

**UPDATE** After 24 hours this has resolved itself. Perhaps it was an ARP issue as I was using the same IP address for virtualised VM as the original machine.

[Alis_Klar]

If I disconnect the virtual switch from the physical network and reconnect the old physical server will I get the same problem. Really don't want DHCP issues when it's not the holidays!

[plexer]

Please be careful messing with live systems like this as you alluded to this is something you would be better off testing in the holidays when you won't have such a big impact on your users.

 

Ben

[Alis_Klar]

I have decided to abandon the p2v project for a DC as there are too many unknowns even for a 2013 R2 DC running under hyper-v 2012 R2 with VMGenID to avoid USN rollback. Will keep DC function on phycial server for now and build new VM ofr other roles on newer OS. Just too risky with the number of critical roles on this server.

 

Was trying to find a quick solution as so many things (inc SIMS) are running from this aging physical server.