[Openstack] Urgent! MTU size issue

Satish Patel satish.txt at gmail.com
Wed Nov 9 22:39:05 UTC 2016

We have DVR setup so if i change path_mtu=1550 in
/etc/neutron/plugins/ml2/ml2_conf.ini  and restart neutron services
does that work?

or do i need to change those setting in controller node?

On Wed, Nov 9, 2016 at 5:25 PM, Satish Patel <satish.txt at gmail.com> wrote:
> if i send request direct to server1 and server2 everything works!! but
> if i point my client to LBaaS VIP it doesn't work.
> LBaaS running on Network Node and server1 and server2 running on compute node.
> So LbaaS traffic coming from Network node to compute node over VxLAN
> (overlay) which has 1450 MTU and that is causing issue. If i change
> that MTU to 1500 it works.
> On Wed, Nov 9, 2016 at 4:58 PM, Rick Jones <rick.jones2 at hpe.com> wrote:
>> On 11/09/2016 08:06 AM, Satish Patel wrote:
>>> We have 3 node cluster on Mikata openstack and we are using DVR
>>> network. Recently we build two puppetmaster server on openstack and
>>> put them behind Lbaasv2 load-balancer to share load but i found my
>>> none of client able to talk to correctly with puppetmaster server on
>>> openstack. After lots of research found openstack VM use mtu 1400 and
>>> my rest of puppet agent server who are not on openstack they used mtu
>>> 1500.
>>> as soon as i change puppet agent MTU size to 1400 everything started
>>> working. But just surprised why openstack use 1400 for VM there must
>>> be a reason like vxlan or GRE.
>>> So for experiment i change mtu 1500 on puppetmaster server on
>>> openstack but it didn't help. How do i fix this issue?
>> What happens if LBaaS isn't between the client and server?
>> Does Puppet do anything with UDP or is it all TCP?
>> rick jones
>> _______________________________________________
>> Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> Post to     : openstack at lists.openstack.org
>> Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack

More information about the Openstack mailing list