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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

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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https://bugs.launchpad.net/bugs/771209

Title:
  VLANs no longer work with bridges in natty

Status in “linux” package in Ubuntu:
  Incomplete

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
  	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)

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