<p dir="ltr">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.  </p>
<div class="gmail_extra"><br><div class="gmail_quote">On Nov 11, 2016 12:07 AM, "Satish Patel" <<a href="mailto:satish.txt@gmail.com">satish.txt@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">In that doc it's not showing how to change MTU of existing created<br>
subnets. currently i am doing following on each veth pair but its not<br>
permanent, so how do i make it permanent across reboot<br>
<br>
ip netns exec qrouter-0363480e-01d7-4557-<wbr>a3b9-e49244aa6a98 ifconfig<br>
qr-9284543e-58 mtu 1500<br>
<br>
Is there any way or API so we can change this value in subnet<br>
<br>
[root@controller-5-1 neutron(keystone_admin)]# neutron net-show<br>
d9d691c2-ec91-48a1-9813-<wbr>e472af249dae | grep mtu<br>
| mtu                       | 1450                                 |<br>
[root@ostack-controller-5-1 neutron(keystone_admin)]#<br>
<br>
On Thu, Nov 10, 2016 at 12:35 PM, Rick Jones <<a href="mailto:rick.jones2@hpe.com">rick.jones2@hpe.com</a>> wrote:<br>
> On 11/10/2016 09:23 AM, Satish Patel wrote:<br>
>><br>
>> figure out..  just need to restart neutron-server  and you have to<br>
>> delete existing network and re-create new network to get those change.<br>
>><br>
>> How to change MTU on existing network-subnet ?<br>
><br>
><br>
> You would likely have to find all the virtual interfaces for it and alter<br>
> them manually on the compute/network nodes.<br>
><br>
> The HPE Helion docs on changing MTU, while describing some things specific<br>
> to HPE Helion, does include the caveat about existing networks not being<br>
> altered:<br>
><br>
> <a href="https://docs.hpcloud.com/hos-3.x/#helion/networking/configure_mtu.html" rel="noreferrer" target="_blank">https://docs.hpcloud.com/hos-<wbr>3.x/#helion/networking/<wbr>configure_mtu.html</a><br>
><br>
> rick jones<br>
><br>
><br>
><br>
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</blockquote></div></div>