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

Tue Aug 25 16:21:29 UTC 2020

> On 25 Aug 2020, at 18:13, Douglas Fischer <fischerdouglas at gmail.com> wrote:
> 
> 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.

Are you certain that the UDP packets exhibit port 0, or is this flow telemetry reporting non-initial fragments as port 0 (they don’t actually have ports).

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Roland Dobbins <roland.dobbins at netscout.com>