[PVE-User] Problem proxmox 2.0 to forward vmbr1 to eth0, eth1, eth2 VM

Flavio Stanchina flavio.stanchina at ies.it
Mon Mar 26 11:34:44 CEST 2012

maykel at maykel.sytes.net wrote:
> Hi! I have installed successfully proxmox 2.0 in my server. It has four
> network cards: [...]
> vmbr1     Link encap:Ethernet  HWaddr 3c:4a:92:7c:4d:b9
>            inet addr:  Bcast:  Mask:
> vmbr2     Link encap:Ethernet  HWaddr 00:26:55:ea:3d:48
>            inet addr:  Bcast:  Mask:
> vmbr3     Link encap:Ethernet  HWaddr 00:26:55:ea:3d:49
>            inet addr:  Bcast:  Mask:
> [...]
> And now, ping to  physical  network card  in theory:
> root at virtual1:~# tcpdump -i vmbr2 icmp ----->>>  Not show anything
> But in vmbr1 yes...

Your network configuration doesn't make sense. You have three network 
cards on the same subnet and you say the cable is not connected on vmbr2 
and vmbr3, so the behavior you see is entirely normal and certainly not 
a bug in Proxmox VE. Packets to and .27 will never traverse 
the physical network interfaces that own those address if the cables are 
not connected, I think that's obvious.

I suggest to test a similar network configuration on two physical 
machines before trying it in a virtualized environment with the 
additional complexities of bridging and virtual networks.

Flavio Stanchina
Informatica e Servizi
Trento - Italy

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