[pve-devel] BUG in vlan aware bridge

Stoyan Marinov stoyan at marinov.us
Tue Oct 12 13:16:27 CEST 2021


I'm having the very same issue with Mellanox ethernet adapters. I don't see this behavior with Intel nics. What network cards do you have?

> On 12 Oct 2021, at 1:48 PM, VELARTIS Philipp Dürhammer <p.duerhammer at velartis.at> wrote:
> 
> HI,
> 
> i am playing around since days because we have strange packet losses.
> Finally I can report following (Linux 5.11.22-4-pve, Proxmox 7, all devices MTU 1500):
> 
> Packet with sizes > 1500 without VLAN working well but at the moment they are Tagged they are dropped by the bond device.
> Netfilter (set to 1) always reassembles the packets when they arrive a bridge. But they don't get fragmented again I they are VLAN tagged. So the bond device drops them. If the bridge is NOT Vlan aware they also get fragmented and it works well.
> 
> Setup not working:
> 
> tapX (tagged) <- -> vmbr0 <- - > bond0
> 
> Setup working:
> 
> tapX (tagged) <- -> vmbr0 <- - > bond0
> 
> Setup also working:
> 
> tapX < - - > vmbr0v350 < -- > bond0.350 < -- > bond0
> 
> Have you got any idea where to search? I don't understand who is in charge of fragmenting packages again if they get reassembled by netfilter. (and why it is not working with vlan aware bridges)
> 
> 
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