nanog mailing list archives

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


From: Töma Gavrichenkov <ximaera () gmail com>
Date: Tue, 25 Aug 2020 15:18:35 +0300

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



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