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Re: [Xen-users] could not get IP address for the interface created by netfront driver on HVM guest

  • To: "Fajar A. Nugraha" <list@xxxxxxxxx>
  • From: veerasena reddy <veeruyours@xxxxxxxxx>
  • Date: Mon, 27 Jun 2011 11:37:28 +0530
  • Cc: xen-users@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Sun, 26 Jun 2011 23:08:56 -0700
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I have specific requirements to run 2.6.35 kernel.
Could you please suggest if there is any other way to get it working without Tx checksum off on dom0.

Thanks & Regards,

On Fri, Jun 24, 2011 at 6:17 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
On Fri, Jun 24, 2011 at 7:31 PM, veerasena reddy <veeruyours@xxxxxxxxx> wrote:
> And when I explicitly ran dhclient on domU, i observed "5 bad udp checksums
> in 5 packets" which was causing drop of packets and the DHCP reply observed
> in tcpdump was not reaching DHCP client.
> when i disabled Tx checksum on the dom0 vif corresponding to the netfront on
> domU, i could successfully get IP address assigned for my interface on
> Guest.
> # ethtool -K vif1.0 tx off  <<<---- executed on dom0
> Any idea why the "bad checksum" happening with PV driver? (while everything
> was fine with pure HVM).

checksum is kinda on-and-off thing with Xen. At this point I'd suggest
trying later kernels for domU. In particular, Ubuntu's 2.6.38-server
kernel work fine on my setup (including DHCP). You might want to start
with latest stable kernel (which shouldn't require any additional


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