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From: Ivan Voras <ivoras@fer.hr>
Date: Mon, 15 Jan 2007 15:06:57 +0100
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Subject: Re: Problem with port 0
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Hug Me wrote:

> 11:08:06.528691 IP (tos 0x4, ttl 255, id 0, offset 0, flags [DF], length:
> 51) 10.0.0.2.0 > 10.0.0.1.69: [udp sum ok]  23 RRQ "load2000v115.d" octet

> We believe FreeBSD is not allowing a UDP source port of 0 and the kernel is
> dropping the packet before it ever reaches the tftp server but are
> unable to
> verify this hypothesis.

A shot in the dark: any firewalls or similar services active on the
FreeBSD box?