[ovs-dev] OvS 2.10 MTU greater than 1518 - not working

Ben Pfaff blp at ovn.org
Wed Oct 17 15:35:20 UTC 2018

On Tue, Oct 16, 2018 at 06:46:52PM -0400, Shahaji Bhosle via dev wrote:
> Just upgraded to 2.10 and running OvS with DPDK , I used to set MTU to 1900
> to accommodate VxLAN headers in 2.9 but not I cannot send packets bigger
> than 1518 bytes. Is this a known issue, I have not got chance to check the
> code, but wanted to check if you know anything

Make sure you adjusted the MTU of both bridges involved.  The bridge
with VXLAN ports should have an MTU smaller than the bridge with the
physical port, by the size of the VXLAN header.

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