VLANs no longer work with bridges in natty

[James McDonald]

I'm not sure which package to put this against - it could be bridge-utils, vlan, linux-image-2.6.35-28-generic or possibly ifupdown. This problem appeared with Ubuntu 11.04 - the same configuration works perfectly with 10.10.

If I use the following /etc/network/interfaces sections:
auto br0
iface br0 inet static
 bridge_ports eth0
 bridge_stp off
 bridge_fd 0
 bridge_maxwait 0
 address 10.58.32.6
 netmask 255.255.248.0
 post-up route add -net 10.58.0.0/16 gw 10.58.32.1

auto vlan100
iface vlan100 inet static
 vlan-raw-device eth0
 address x.y.z.11
 netmask 255.255.255.224
 gateway x.y.z.1

Both interfaces appear to come up, but the vlan interface cannot communicate - it can't even ping the gateway on its network. Changing the vlan-raw-device to br0 yields the same result. If I remove the br0 section and configure eth0 directly everything works as expected.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: vlan 1.9-3ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Tue Apr 26 14:15:14 2011
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: vlan
UpgradeStatus: Upgraded to natty on 2011-04-14 (11 days ago)

[Harald Hannelius (harald-arcada)]

I'am having the same problem.

'ping6 -I br1 fe80::1' where br1 is a bridge tied to eth0.1 (VLAN) doesn't work.

[Harald Hannelius (harald-arcada)]

Apparently this is known in VLAN and bridging;

http://permalink.gmane.org/gmane.linux.network.bridge/5362

The (short term?) fix would be to install ebtables, and the run the command;

  ebtables -t broute -A BROUTING -i eth0 -p 802_1Q -j DROP

This got my interfaces bridging with VLAN again.

[Harald Hannelius (harald-arcada)]

Adding to the previous comment that this is a thing for linux 2.6.38.

[darck (darck)]

Hello,

This commit seems to be related to this bug :
http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commit;h=6a32e4f9dd9219261f8856f817e6655114cfec2f

[penalvch (penalvch)]

James McDonald, thank you for reporting this bug to Ubuntu. Natty reached EOL on October 28, 2012.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Is this an issue in a supported release? If so, could you please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect 771209

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]