So I had a power outage yesterday and it was longer than my UPS's battery (over an hour).
Anyhow, the hyper v server power went out. After the power outage I booted it up, but the networking (external) on any of the nics does not work anymore. I have 3 nics in it, one for the host and one each for 2 vm's. I should say networking does not work over the nics anymore. Cant ping to the server from outside, nor ping from the server.
If I go into sconfig it shows the hosts nic, as usual, plus a test internal network nic I had not yet removed. using coreconfig I can see those nics as well, they show enabled and connected. Also the switch I plug into shows that they are connected (lights on, 1 Gbit connection) All networking parameters are as they should be (ip, subnet, etc)
Using core config VM section, both vm's are up and running.
I have tried restarting, powerting off completely and restarting, enebling/disbaling the nic, plugging into different switch ports, tried a different switch. All my other servers are running fine, including two vm servers, so its unlikely external to the server.
At this point I really have no idea what to try next. I dont have any spare nics to go try, but I doubt its NIC's considering all 3 are not functional (or better to say the network is not running over any of the 3 nics)
Any suggestions as to some things I can try?
Thanks
Best Answer
Did you have any other equipment reboot due to the power outage? It almost sounds like there were VLAN tagging settings required for connectivity on a network switch that were lost because no one wrote the running-config to memory.
First make sure that you can access the Hyper-V host. You need to verify that your management interface hasn't been accidentally set to an Internal or Private interface in Hyper-V's Virtual Network Manager. Once you who have successfully verified that you have connectivity to the host you can move on to the VMs.
Verify that your two NICs that are designated for use by your VMs are "External Connections" in Hyper-V's Virtual Network Manager. Make sure the checkbox "Allow management operating system to share this adapter" is also enabled. You should now be able to ping or connect to the IP address for both of these NICs. Then confirm that Virtual Network or Virtual Interface you are connecting to each NIC is added to the appropriate VMs.