[Openstack] Urgent! MTU size issue

Satish Patel satish.txt at gmail.com
Wed Nov 9 22:25:15 UTC 2016

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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