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[Andrew Woodward <xarses@xxxxxxxxx>]

I'm re opening this bug as I just beat my head against it.

I've been able to reproduce this in

Ubuntu 12.04 LTS 3.8.0-31-generic

Running dnmasq from Centos 6.4

I'll update the details here in a few days. I'm assigning me to track
that

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Andrew Woodward (xarses)

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https://bugs.launchpad.net/bugs/610391

Title:
  UDP checksum offload breaks DHCP on virtual machines

Status in The Linux Kernel:
  Unknown
Status in “isc-dhcp” package in Ubuntu:
  Invalid
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  When running an Ubuntu server on RHEL6 the dhclient on Ubuntu will
  report 'bad udp checksum' in response to the DHCP Offer packets coming
  from the Host.

  This is on a libvirt controlled KVM system using libvirt controlled
  dnsmasq processes on the Host.

  Optimisations within the kernel appear to be upsetting dhclient.

  http://www.pubbs.net/201004/dhcp/30492-dhcpd-problem-on-virtual-
  machines.html

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: linux-image-2.6.32-24-generic-pae (not installed)
  Regression: Yes
  Reproducible: Yes
  ProcVersionSignature: User Name 2.6.32-24.38-generic-pae 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic-pae i686
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory
  CurrentDmesg:
   [   13.240032] eth0: no IPv6 routers present
   [ 2868.734972] psmouse.c: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing 1 bytes away.
  Date: Tue Jul 27 09:33:31 2010
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  MachineType: Red Hat KVM
  PciMultimedia:
   
  ProcCmdLine: root=UUID=129537b3-af8e-4e06-bd9d-06626fa40823 ro quiet splash
  ProcEnviron:
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux
  dmi.bios.date: 01/01/2007
  dmi.bios.vendor: Seabios
  dmi.bios.version: 0.5.1
  dmi.chassis.type: 1
  dmi.chassis.vendor: Red Hat
  dmi.modalias: dmi:bvnSeabios:bvr0.5.1:bd01/01/2007:svnRedHat:pnKVM:pvrRHEL6.0.0PC:cvnRedHat:ct1:cvr:
  dmi.product.name: KVM
  dmi.product.version: RHEL 6.0.0 PC
  dmi.sys.vendor: Red Hat

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