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After drill down issue, i found i hit by following bug where lbaas set
MTU from host interface 1500 but VxLAN use 1450 and it breaking
communication :(

https://review.openstack.org/#/c/268321/2/neutron_lbaas/services/loadbalancer/drivers/haproxy/namespace_driver.py

On Thu, Nov 10, 2016 at 3:12 PM, Nasir Mahmood <nasir.mahmood at gmail.com> wrote:
> This is gonna hurt the os , but for this , you will need to change these
> parms inside the neutron db. Which , for  me at least, was asked to avoid at
> maximum.
>
>
> On Nov 11, 2016 12:07 AM, "Satish Patel" <satish.txt at gmail.com> wrote:
>>
>> In that doc it's not showing how to change MTU of existing created
>> subnets. currently i am doing following on each veth pair but its not
>> permanent, so how do i make it permanent across reboot
>>
>> ip netns exec qrouter-0363480e-01d7-4557-a3b9-e49244aa6a98 ifconfig
>> qr-9284543e-58 mtu 1500
>>
>> Is there any way or API so we can change this value in subnet
>>
>> [root at controller-5-1 neutron(keystone_admin)]# neutron net-show
>> d9d691c2-ec91-48a1-9813-e472af249dae | grep mtu
>> | mtu                       | 1450                                 |
>> [root at ostack-controller-5-1 neutron(keystone_admin)]#
>>
>> On Thu, Nov 10, 2016 at 12:35 PM, Rick Jones <rick.jones2 at hpe.com> wrote:
>> > On 11/10/2016 09:23 AM, Satish Patel wrote:
>> >>
>> >> figure out..  just need to restart neutron-server  and you have to
>> >> delete existing network and re-create new network to get those change.
>> >>
>> >> How to change MTU on existing network-subnet ?
>> >
>> >
>> > You would likely have to find all the virtual interfaces for it and
>> > alter
>> > them manually on the compute/network nodes.
>> >
>> > The HPE Helion docs on changing MTU, while describing some things
>> > specific
>> > to HPE Helion, does include the caveat about existing networks not being
>> > altered:
>> >
>> > https://docs.hpcloud.com/hos-3.x/#helion/networking/configure_mtu.html
>> >
>> > rick jones
>> >
>> >
>> >
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