TCP and UDP Port 0 - Should an ISP or ITP Block it?

Tue Aug 25 11:13:36 UTC 2020

I think that the subject of the e-mail is very self-explanatory.

With some analysis of what is running over our network, ISP or ITP, we will
be able to see some TCP/UDP(mostly UDP) packets with source or
destination to port 0.

I can think of a genuine use of it.
(Maybe someone cloud help me see what I'm not seen.)

So I have two questions:

a) Should an ISP block that Kind of traffic?
(like anti-spoofing on BNG/B-RAS)

b) Should a Transit Provider block that Kind of traffic?

-- 
Douglas Fernando Fischer
Engº de Controle e Automação
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