On Mon, 27 Apr 2009, Karsten Br?ckelmann wrote:

y.real-at999.z @ a.at.real-at2.bc ->
    y.real-at999.z.real-at1000.a.at.real-at2.bc

Still ambiguous. So the generated s/at/real-at$n/ is the last occurrence
of a numbered "real-at" plus 1.

What if we need it twice, and there are 3 such thingies in total? How do
we know we only need to "decode" 1 -- or do we need to decode2? Or maybe
even all three, if they start at 1...

Sorry, Adam. ;)

How about "_at_" - I think a leading and trailing underscore will be very rare in real world domain name parts, especially as you can't register a domain name having an underscore, and may apps will discard hostnames with underscores as invalid.

Will the DNS server choke on that? Remember, it only has to be valid within the scope of a DNS query.

 y.real-at999.z @ a.at.real-at2.bc ->
     y.real-at999.z._at_.a.at.real-at2.bc

--
 John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
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