Hi,

Looking to tunnel vxlan underlay. Current vxlan implementation seem to mandate that the same port number be used locally and remotely.

(1) Is there a way to set the local port being listened-to to XXXX and the destination port used when sending packets across the underlay to YYYY?
(2) If not, there seem to be no way to open a tunnel ingress in the same netns since it also would need to use the same port as vxlan uses resulting in "address already in use".

Any suggestion apart from resolving this with additional network namespaces?

You can try Ubuntu 24.04. It supports more options.