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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

Ubuntu bug:

https://bugs.edge.launchpad.net/linux/+bug/610391

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. **

We solved that using netfilter, Michael ,please find the bug number to point to and close this bug

*** This bug has been marked as a duplicate of bug 605555 ***

I can't see that bug. What is the fix?

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

Change to verified?

*** This bug has been marked as a duplicate of bug 605555 ***