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[Bug 771209] Re: VLANs no longer work with bridges in natty


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

** Package changed: ubuntu => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  VLANs no longer work with bridges in natty

Status in “linux” package in Ubuntu:

Bug description:
  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
  	post-up route add -net gw

  auto vlan100
  iface vlan100 inet static
  	vlan-raw-device eth0
  	address x.y.z.11
  	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
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  Date: Tue Apr 26 14:15:14 2011
   PATH=(custom, user)
  SourcePackage: vlan
  UpgradeStatus: Upgraded to natty on 2011-04-14 (11 days ago)

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