Problems with DNSSEC -- answer in fragmented UDP doesn't work

[David DeSimone]

Kevin Oberman wrote:
>
> For ipfw you need something like "allow ip from any to me frag". If you
> want to restrict this to DNS, restrict it to dst-port 53.

Unfortunately, UDP fragments only contain the port number in the very first fragment.  So you will not be able to forward the later fragments based on port number.  You can only see the Src/Dest IP and Protocol number in the fragment.

--
David DeSimone == fox at verio.net == Network Admin
  "I don't like spinach, and I'm glad I don't, because if I
   liked it I'd eat it, and I just hate it." -- Clarence Darrow
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