Clark Boylan <cboy...@sapwetik.org> wrote:
On Mon, Jan 11, 2016, at 12:35 PM, Sean M. Collins wrote:
Nice find. I actually pushed a patch recently that we should be
advertising the MTU by default. I think this really shows that it should
be enabled by default.
https://review.openstack.org/263486l
++ Neutron should be able to determine what the outer MTU is and adjust
the advertised inner MTU automatically based on the overhead required
for whatever tunnel protocol is in use all without the deployer or cloud
user needing to know anything special.
Let me clarify: there is still requirement for the image you boot to honour
one of the ways we advertise MTU from neutron (DHCP MTU opton; RA for IPv6
networks; …) Neutron cannot change mtu for the device that is seen from
inside of the instance.
That said, most real images, including cirros since last year, should
support the DHCP option.
Ihar
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