Re: [RFC v3 3/3] vxlan: handle underlay VRF changes

On 11/20/18 9:58 AM, Alexis Bauvin wrote:

A socket bound to vrf-blue listens on *:4789, thus owning the port. If moving an
underlay to the default vrf (ip link set dummy-b nomaster), a new socket will be
created, unbound to any interface and listening on *:4789. However, because it
will be in the default vrf, it will try to take ownership of port 4789 on ALL
vrfs, and fail because this port is already owned in vrf-blue for vxlan-a.

SO_REUSEPORT will fix that and incoming traffic through a vrf and
default (non-)vrf will work. The recent changes by Vyatta provide even
better isolation of default vrf and overlapping ports.