[Bug 610391] Re: UDP checksum offload breaks DHCP on virtual machines
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610391 at bugs.launchpad.net
Fri Oct 27 10:22:48 UTC 2017
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On 2010-07-27T09:23:17+00:00 Neil wrote:
Description of problem:
While running an Ubuntu Lucid virtual server under kvm on RHEL6, the
DHCP system reports 'bad udp checksum' in response to DHCP offer packets
coming from the libvirt launched dnsmasq process on the Host. Comparing
RHEL5 to RHEL6 show that tx checksumming is switched on across the
'vnet' interfaces.
Version-Release number of selected component (if applicable):
kernel.x86_64 2.6.32-44.1.el6 @anaconda-
RedHatEnterpriseLinux6-201004141252.x86_64/6.0
How reproducible:
Setup a virtual network handing out DHCP addresses and run a virtual
machine running dhclient3. If you run the dhclient3 in the console, you
will see 'bad udp checksum in 5 packets' errors. tcpdump shows that the
DHCP offer packet are reaching the virtual machine.
Steps to Reproduce:
1.
2.
3.
Actual results:
'bad udp checksum in 5 packets'
Expected results:
virtual machine picks up the ip address as normal.
Additional info:
http://www.pubbs.net/201004/dhcp/30492-dhcpd-problem-on-virtual-
machines.html
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/0
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On 2010-07-27T09:56:41+00:00 Neil wrote:
Ubuntu bug:
https://bugs.edge.launchpad.net/linux/+bug/610391
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/3
------------------------------------------------------------------------
On 2010-07-27T09:58:06+00:00 RHEL wrote:
This issue has been proposed when we are only considering blocker
issues in the current Red Hat Enterprise Linux release.
** If you would still like this issue considered for the current
release, ask your support representative to file as a blocker on
your behalf. Otherwise ask that it be considered for the next
Red Hat Enterprise Linux release. **
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/4
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On 2010-07-28T12:53:58+00:00 Dor wrote:
We solved that using netfilter, Michael ,please find the bug number to
point to and close this bug
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/5
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On 2010-07-28T13:55:57+00:00 Michael wrote:
*** This bug has been marked as a duplicate of bug 605555 ***
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/6
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On 2010-07-28T14:39:03+00:00 Neil wrote:
I can't see that bug. What is the fix?
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/7
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On 2010-07-29T10:31:47+00:00 Neil wrote:
Verified the bug with libvirt-0.8.1-15.el6.x86_64,
kernel-2.6.32-52.el6.x86_64 and iptables-1.4.7-3.el6.x86_64, and PASSED
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/8
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On 2010-08-03T14:56:27+00:00 Michael wrote:
Change to verified?
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/9
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On 2010-08-04T21:50:39+00:00 Dor wrote:
*** This bug has been marked as a duplicate of bug 605555 ***
Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/610391/comments/10
** Changed in: linux
Status: Unknown => Invalid
** Changed in: linux
Importance: Unknown => Critical
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https://bugs.launchpad.net/bugs/610391
Title:
UDP checksum offload breaks DHCP on virtual machines
Status in Linux:
Invalid
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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