From owner-freebsd-net@FreeBSD.ORG  Tue Jan 16 18:11:48 2007
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From: Chuck Swiger <cswiger@mac.com>
Date: Tue, 16 Jan 2007 10:11:46 -0800
To: Randall Stewart <rrs@cisco.com>
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Cc: freebsd-net <freebsd-net@freebsd.org>
Subject: Re: Problem with port 0
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On Jan 16, 2007, at 5:15 AM, Randall Stewart wrote:
> So... I guess this really leads to a question..
>
> What does "reserved" mean by IANA.

"reserved" means one "SHOULD NOT" use that port, where the phrase in  
caps is defined in RFC-2119 (http://www.ietf.org/rfc/rfc2119.txt).  And:

   http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

...states: "0/tcp,udp: Reserved; do not use (but is a permissible  
source port value if the sending process does not expect messages in  
response)"

-- 
-Chuck