This problem is killing me. :-)
Recently, we deployed a new HP DL360 G6, installed ESXi v4, and setup 4 guest OS's with Windows 2003 Server R2, SP2. One of the guest OS's has DHCP services running.
First found in the mornings, DHCP will no longer work for LAN's outside of the subnet of the server (3 outside offices use DHCP from this server). DHCP works fine on the LAN it's physically connected to.
The temporary fix is usually to restart the guest OS with DHCP, but sometimes this doesnt work either. Further tinkering will usually get the services working properly again. (i.e stop/start DHCP)
We have Cisco routers with DHCP relays/helpers enabled, and I'm told these are all configured properly. Since the DHCP starts to work after tinkering with the server (ex: restart or DHCP services restart ...), I am thinking the Cisco routers are likely configured properly.
So I would like to ask for some troubleshooting steps which could help me find the cause of the issue.
I have looked at the mon-fri DHCP logs, and cannot seem to verify if they look normal. There are a ton of the following messages:
31,12/21/09,11:55:08,DNS Update Failed,192.168.64.143,USPLY1107.domain.int,-1
If you have some ideas - please help! Any ESX changes I can try? I can provide much more information if needed. Thanks!