[Openstack-operators] [openstack-operators]disable snat for router gateway

Aaron Segura aaron.segura at gmail.com
Tue Jan 19 16:56:45 UTC 2016

It's possible.  We do it all the time.

However, without proper routing, Kevin and Joseph are correct.  The VM will
never receive replies to outbound packets because the upstream devices
don't know where to send them.

I also forgot to mention - The edge device also needs to NAT the fixed IP
of the VM to a public IP if you intend for your VMs to access the
Internet.  We use a global PAT rule to catch any VMs without a floating IP
and allow them egress on a shared public IP.

On Tue, Jan 19, 2016 at 10:09 AM Akshay Kumar Sanghai <
akshaykumarsanghai at gmail.com> wrote:

> Hi Aaron,Mike,Kevin,Joseph,
> Thanks for your inputs.
> But I am still confused as Aaron and Mike are suggesting that it is
> possible and Joseph and Kevin are suggesting its not possible.
> I tried to ping from the vm in openstack to outside of the cloud with only
> fixed ip assigned, but ping failed. When i assigned the floating ip to that
> vm, I can ping a system outside of the cloud. So, I am in doubt whether it
> is possible or not or there is some configuration issue in my setup.
> Guys, Please help as i can't find a proper documentation regarding this.
> Thanks,
> Akshay
> On Tue, Jan 19, 2016 at 8:47 PM, Mike Spreitzer <mspreitz at us.ibm.com>
> wrote:
>> Aaron Segura <aaron.segura at gmail.com> wrote on 01/16/2016 12:19:53 PM:
>> > You shouldn't have to do anything other than disable SNAT and set a
>> > route for your tenant network upstream.
> Indeed, I have exercised exactly this.
>> Regards,
>> Mike
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