From owner-freebsd-net@FreeBSD.ORG  Wed Jan 17 22:32:02 2007
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From: Bill Fenner <fenner@research.att.com>
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Date: Wed, 17 Jan 2007 14:31:58 -0800
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Cc: freebsd-net@freebsd.org, Randall Stewart <rrs@cisco.com>,
	"Bruce M. Simpson" <bms@freebsd.org>,
	Ricardo Nabinger Sanchez <rnsanchez@wait4.org>
Subject: Re: Problem with port 0
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Hug,

  If you feel like building a new kernel, I'd suggest commenting
out those lines that I quoted in in_pcb.c:

           if (sin->sin_port == 0)
                   return (EADDRNOTAVAIL);

and see if the FreeBSD tftpd behaves the way you want after that.
I don't think that's the solution that should be committed, but
I think that may get you what you need (and the fix should be
the same across any FreeBSD version, as long as you can build
a new kernel for your varied boxes).

  Bill