[pve-devel] lost tcp packets in bridge

Eneko Lacunza elacunza at binovo.es
Tue Aug 22 08:33:17 CEST 2017

Hi Stefan,

This is a "just in case", not that I think this is you issue really.

We have seen lost packets with bridge + vlans and pfsense and Debian 
guests; swiching to a virtual interface per vlan in pfsense fixed the 
problem, but we didn't dig very deep into the problem (we saw this 
problem in at least 2 deployments).

We've been told that it seems that in latest 4.4 version/latest pfsense 
this issue doesn't seem to happen, not very sure what was the source of 
the problem.


El 22/08/17 a las 08:04, Stefan Priebe - Profihost AG escribió:
> Hello,
> while running PVE 4.4 i'm observing lost tcp packets on a new cluster.
> Two VMs are connected to the same bridge on the same host using virtio
> and linux as a guest.
> But the target guest does not receive all tcp packets some get lost. I
> see them leaving on the source using tcpdump but they do not arrive at
> the target network card (checked using tcp dump). This results in
> sometimes awfully slow performance as tcp retransmits happen.
> I already flushed all iptables rules - but this did not help. I can't
> reproduce the issue it just happens "sometimes" with some packets.
> Has anybody already ovserved something like this?
> Greets,
> Stefan
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