[Openstack-operators] Problems understanding/running the flat network mode

Shaon mdshaonimran at gmail.com
Tue Aug 16 15:52:32 UTC 2011

i have downloaded image from

and also facing the same problem, cannot access or my running instances.

However, I am facing another weird problem here. I can easily launch an
instance from the dashboard, but when I try to run it from command line, I
lost my internet connection, and this happens to all of my PCs connected to
the same router. To solve this I have to restart the network of the
controller node to get connected again.

On Tue, Aug 16, 2011 at 9:34 PM, Arjun Datta <ADatta at primustel.ca> wrote:

> Hi,
> I have a similar problem but my networking seems to be setup correctly.
> Does one need to authorise SSH as well ? I also, cannot ping or SSH to
> any running instances.
> Regards,
> Arjun Datta
> -----Original Message-----
> From: openstack-operators-bounces at lists.openstack.org
> [mailto:openstack-operators-bounces at lists.openstack.org] On Behalf Of
> Christian Wittwer
> Sent: August-15-11 12:12 PM
> To: openstack-operators at lists.openstack.org
> Subject: Re: [Openstack-operators] Problems understanding/running the
> flat network mode
> Hi,
> I found a solution. The problem was, that I had no ip on that host in
> that subnet.
> Therefore all packages to were sent to my default gw,
> which was wrong.
> I created a "virtual" interface on the bridge, where the instances are
> connected to.
> br100:0   Link encap:Ethernet  HWaddr 00:22:19:6d:87:3a
>          inet addr:  Bcast:
> Mask:
> After that, the network is running and I'm able to ping my instances.
> But now I'm looking into flat dhcp mode, because I'm going to have
> windows instances, and the ip injection doesn't work with windows afaik.
> Cheers,
> Chris
> 2011/8/15 Shang Wu <shang at ubuntu.com>:
> > Hi Chris,
> >
> > On 11-08-13 06:16 PM, Christian Wittwer wrote:
> >> I can startup a instance, it gets a ip from that pool, but I'm unable
> >> to ping it.
> >
> > The first thing that come to my mind is that you need to run the
> > euca-authorize command to enable the ICMP protocol. If you haven't
> > done it already, this might be something worth look into.
> >
> > Regards,
> >
> > --
> > Shang Wu
> >
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