network problem on win vm

[Stefano Giunchi]

I have a cluster with proxmox 4.4.
Three nodes, two IBM x3400 and a small PC. The two IBM host ceph data, the third is only monitor.

I added another server, HP DL380 G7, installed Proxmox 5.2 on it and joined to the cluster (still not ceph).
I will later upgrade the other servers.

I have a problem with some Windows Server VMs, when I migrate them to the new server they start losing pings. A particular VM, with Win2008r2, loses 80% of pings. Linux VMs have no problems.
If I migrate back the VM to IBM, it doesn't lose any ping.

I tried to replace the virtual nic from E1000 to RTL3189.
The node has 2 nics (NetXtreme BCM5709) in bonding. I tried to disconnect one cable to exclude problems with bonding.

Any other suggestion?

 

[menk]

try virtio driver for nic inside virtual machine...

 

[Stefano Giunchi]

try virtio driver for nic inside virtual machine...

I will try that. I did read that VirtIO network drivers are the best for Linux VM but not windows.

 

[menk]

i ever use virtio driver for vm (windows and linux)....
i use stable driver version....
https://docs.fedoraproject.org/en-US/quick-docs/creating-windows-virtual-machines-using-virtio-drivers/

 

[mailinglists]

Might be related to lower networking layer.
When testing check out ARP table on both sides (maybe also on the switch), as well as capture network traffic.
Capturing network traffic will allow you to pinpoint the cause of the problem.
On Linux use tcpdump, on Windows there is Wireshark, I think.

I do not think network drivers will help, but hopefully they will.

 

[Stefano Giunchi]

Sorry for my late reply.
It was a bonding issue, I did setup it in RR mode. Once it has been changed to ALB mode, everything worked perfectly.