[Openstack] Urgent! MTU size issue

Satish Patel satish.txt at gmail.com
Wed Nov 9 23:00:20 UTC 2016

This is very interesting https://bugs.launchpad.net/neutron/+bug/1376446

On Wed, Nov 9, 2016 at 5:39 PM, Satish Patel <satish.txt at gmail.com> wrote:
> 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
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