ICMP with big data do'nt work

[operador]

Hi, I have a network problem that I can't find a solution.

If I do:
ping -c 3 -l 3000 hypervisor1 hypervisor2

works!!

But if I do:
ping -c 3 -l 3000 kvmVM1 kvmVM2
IT DOES NOT WORK if the MVs are on different hypervisors.

It works with sizes smaller than 1500 (MTU) for example:
ping -c 3 -l 1000 kvmVM1 kvmVM2.

Does anyone know how to fix this problem?

Thanks!!!

 

[t.lamprecht]

Does anyone know how to fix this problem?

One needs to tell the virtio NIC also the non-standard MTU, a patch has been proposed but not yet applied.

https://pve.proxmox.com/pipermail/pve-devel/2019-December/040999.html

 

[operador]

It's a pity, using the e1000 driver does not solve the problem. Hopefully a solution is implemented.

Thank you