On Jan 12, 2007, at 2:13 PM, Bruce M. Simpson wrote:
Ricardo Nabinger Sanchez wrote:
But port 0 has special meaning to the kernel (ie, "give me some
random
port"). Also, it is a reserved one. Please check IANA:
http://www.iana.org/assignments/port-numbers
I'm afraid you'll have to select another port number.
Nope. A source port of 0 is perfectly legal for UDP.
There's nothing in RFC-768 which forbids one from using a source or
destination port of 0, but it also is true that IANA reserves 0/tcp
and 0/udp for exactly the reasons Ricardo mentioned. I know that at
least some firewalls will explicitly drop traffic using port 0
because it is expected that a well-behaved network stack will
reassign a random ephemeral port rather than sending traffic out to
or from port 0...YMMV.
--
-Chuck
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