Do you have a security groups allow rule for GRE? If so, do you have the nf_conntrack_proto_gre module loaded on your compute nodes? If not, the security groups iptables filtering will end up dropping the GRE packets. On Fri, Apr 15, 2016 at 1:38 AM, Cory Hawkless <Cory at hawkless.id.au> wrote: > Does anyone know if there is any reason I’m having trouble getting GRE > traffic into my instances? > > I have a router out on the internet an I’m trying to build a GRE tunnel > into an instance to link a site office to my Openstack network, but looking > at packet dumps from inside the VM I can’t see any GRE packets making it in > at all? > > > > Regards, > > Cory > > _______________________________________________ > OpenStack-operators mailing list > OpenStack-operators at lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20160415/3ae7c170/attachment.html>