Ticket #11031 (new defect)

Opened 19 months ago

Last modified 18 months ago

'Bridged Networking' on host vlan interfaces does not work

Reported by: nocternal Owned by:
Priority: major Component: network
Version: VirtualBox 4.2.0 Keywords:
Cc: Guest type: other
Host type: Linux


I have searched the forums, and looked on the internet... and this seems to be a regression in the 4.2.0 release. Downgrading back to 4.1.22 on the same kernel resolves the issue.

I am on gentoo 64-bit, running gentoo-sources-3.6.0. Same results on 3.5.4

I have a vm-host with several 1q vlan interfaces on it. I then bind my VM's to a particular interface using the 'Bridge Adapter'. The VM's are vlan-agnostic.

The symptom I have on VB 4.2.0 is that none of my VM's have network access. As soon as I switch to NAT on the VM's everything works fine. Downgrading to 4.1.22 on the same kernel restores network access for the 'Bridge Adapter'.

daffy TAZ6 # cat /proc/net/vlan/config
VLAN Dev name    | VLAN ID
eth0.10        | 10  | eth0
eth0.11        | 11  | eth0
eth0.12        | 12  | eth0
eth0.13        | 13  | eth0
eth0.14        | 14  | eth0
eth0.20        | 20  | eth0
eth0.25        | 25  | eth0

My VM-HOST network layout:

                              eth0.10--bridged--VM1, VM2, VM3....
                              eth0.11--bridged--VM6, VM7, VM8

The ROUTER and VM-HOST have the VM's MAC address in their arp tables. The VM itself only has the VM-HOST's MAC address - but not the ROUTER's. The VM can communicate with the VM-HOST but not anything else on the same L2 vlan. All other devices on the same L2 vlan have VM's MAC address (after a ping, say) but the VM never has any of the other hosts in it's arp table. Seems like packets destined to the VM never make it past the VM-HOST. I don't see any odd kernel events.

This is the forum post I started prior to this bug -

I can attach all the details here if need be.


VBox-TAZ6.log Download (77.1 KB) - added by nocternal 19 months ago.
VM running on VB 4.2.0 with no network access.

Change History

Changed 19 months ago by nocternal

VM running on VB 4.2.0 with no network access.

comment:1 Changed 18 months ago by nocternal

Tried an upgrade - still seeing the same problem on VB 4.2.2. Back to 4.1.22 for the time being...

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