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Hi Kuryr team,

When the network in neutron using overlay for vm,
it will use dhcp option to control the VM interface MTU,
but for docker, the ip address does not get from dhcp.
So it will not set up proper MTU in container.

Two work-around in my mind now:
1. Set the default MTU in docker to 1450 or less.
2. Manually configure MTU after container start up.

But both of these are not good, the idea way in my mind
is when libnetwork Call remote driver create network,
kuryr create neutron network, then return Proper MTU to libnetwork,
docker use this MTU for this network. But docker remote driver
does not support this.

Or maybe let user config MTU in remote driver,
a little similar with overlay driver:
https://github.com/docker/libnetwork/pull/1349

But now, seems like remote driver will not do similar things.

Any idea to solve this problem? Thanks.


Regards,
Liping Mao