Network problem after upgrading from CentOS6.4 to CentOS6.6

[MarkAnthony]

While I was searching, I found this post viewtopic.php?f=14&t=44625
In there,rraehal downgraded the nic in Hyper-V to be a legacy one, basically Intel e1000
So I've done the same and have an IPv4 address again
And can reach the network....

So that could be a workaround Vahraba?
I'm going with it as a workaround, Not sure if there is packet loss though as in that post...
However, at least I have the server up now... anything else I'll have to fix on the fly

Thanks for the help gerald_clark/poky

[amlinNoo]

I have been in the same boat with my kvm virtual guests. I found that by restarting libvirtd, my kvm virtual guests are able to ping outside the gateway. This issue also occurs when I fiddle with my hosts firewall, which of course, restarting libvirtd fixes it.

One thing I have yet to fix is being able to ping my host without getting "Destination Host Unreachable".

[cowen]

I had same problem. Hypervisor broke after changing my /etc/hosts hostname. Changing it back to how it was when I installed virtual hosts fixed it and I am now able to connect again. I would like to know how to change my hostname without breaking all of my virtual hosts.