On Sat Apr 02, 2022 at 06:41:12PM +0100, lejeczek wrote:

1370 (server) VS 1320 (client)

Could some expert or two shed more light on what & why is happening?

There is a (very small) clue in the name: Maximum *Transmission* Unit.

Routing between two IP addresses is not (necessarily) symetric: routes are computed independently in each direction. So there is probably a (1320 MTU) device somewhere inbetween which is only crossed by packets in the client->server direction, but not in the reverse.

--
Mark Lawrence

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