[SOLVED] VMs migration problem

[daruom13]

Hello,

I have a strange problem with my VMs.
I have 2 dedicated servers at OVH, and they are connected with a local ip by their second network card (vmbr1). The servers are clustered and I created a GRE tunnel between them.

There is a PfSense VM with a failiver IP in front of 4 vlan.
When all the VMs are on the same server, they all work fine.

On the other hand, when I move a VM on the second server, a strange problem occurs. The VM has internet access (apt upgrade ok, ping google ok), but cannot use wget.

The connection with the target is successful, but is on permanent standby. I don't know where the problem comes from.

network configuration host1 :


network configuration host2 :


The vm "prometheus" is on server 1 so all works :


I move the vm on server 2 :


on the last capture, the last line of wget (in French) indicates:
"http request transmitted, awaiting response"

It remains like this time that I do not stop it.

Thank you in advance.

 

[spirit]

Maybe try to reduce mtu if https,ssh are not working. They dont allow fragmented packets. Because of the Gre tunnel

 

[daruom13]

Hello and thank you for your answer.

it was indeed the MTU. I forgot it when setting up the GRE tunnel. I set it to 9000, now it works.

Thank you so much.