openstack team mailing list archive

[Alessandro Tagliapietra <tagliapietra.alessandro@xxxxxxxxx>]

2012/9/5 andi abes <andi.abes@xxxxxxxxx>

> I've heard of folks having issues with UDP checksum not being
> generated correctly, and having success by running the command below
> on the nova compute nodes.
>
> iptables -A POSTROUTING -t mangle -p udp --dport 68 -j CHECKSUM
> --checksum-fill
>

Yeah, I've seen the checksum issue on > 3.2 kernels, but it's there also on
3.2 which works fine. Maybe they've added a more strict check.
A temp workaround is to put the interface in promiscous mode which some
guys reported it to work.

Ale


>
>
> I'm not sure if this affects the versions you're working with.
>
> On Wed, Sep 5, 2012 at 10:41 AM, Anton Haldin <ahaldin@xxxxxxxxxxxxxxxx>
> wrote:
> > I have the same issue  ( kernel 3.5 , guest vm cannot get response from
> > dnsmasq )
> >
> >
> > On Fri, Aug 10, 2012 at 7:08 AM, Lorin Hochstein <
> lorin@xxxxxxxxxxxxxxxxxx>
> > wrote:
> >>
> >>
> >> On Aug 9, 2012, at 3:22 AM, Alessandro Tagliapietra
> >> <tagliapietra.alessandro@xxxxxxxxx> wrote:
> >>
> >> > Hello guys,
> >> >
> >> > i've just installed kernel 3.4 from Ubuntu kernel PPA archive and
> after
> >> > this upgrade VM aren't able to get the DHCP address but with tcpdump
> i see
> >> > the request and offer on the network.
> >> > Someone else experienced this? I've tried also with 3.3, same story.
> >> > Rolling back to 3.2 and everything works fine.
> >> >
> >>
> >>
> >> When I had a similar problem the issue turned out to be that I needed to
> >> configure the NIC on the compute host to be in promiscuous mode,
> otherwise
> >> the DHCP response wouldn't make it to the VM.
> >>
> >> Lorin
> >>
> >> Sent from my iPad
> >>
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