Hi, Brian,
On 2/20/2017 11:34 AM, Brian E Carpenter wrote:
On 21/02/2017 01:33, John C Klensin wrote:
...
Well UDP source port 0 means don't reply (RFC 768). It's for
uni directional streams.
As for 0 to select a ephemeral port that is a BSD sockets
convention. That isn't something the IETF should specify.
While _assignment_ of a por is an IETF matter and I mostly agree
with Mark, recognition of how one is being used is is a little
different.
It seems to me that this is rather more an IANA registry matter
than a standardization one
Not quite though. Noting the RFC 768 usage as a source port, aren't
all these uses equivalent to saying 'Not valid on the wire as a
destination port'?
I don't think so.
768 says that if you receive 0 as source, do not reply.
That doesn't mean you can't *initiate* to port 0, if it is ever assigned.
Joe