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

Peace, On Tue, Aug 25, 2020, 3:14 PM Jon Lewis <jlewis@lewis.org> wrote:

When an application sends more data via UDP than can be fit in a single packet, only the first packet has a UDP header [where the port info is stored]. The rest of the fragments have no UDP header, which most things will report as UDP src/dst port = 0.

Oh yes, if you don't reassemble fragments on your equipment then please please do not filter anything. -- Töma