On Feb 7, 2013, at 12:51 PM, Tony Finch <[email protected]> wrote:
> Jim Pazarena <[email protected]> wrote:
>>
>> while it can resolve "webmail.acrodex.com" ( 139.142.184.10 )
>> it cannot reverse resolve 139.142.184.10
>
> They are using classless reverse DNS, which is fine except that the
> nameservers for the target zone are very broken.
>
> 10.184.142.139.in-addr.arpa. CNAME 10.0-25.184.142.139.in-addr.arpa.
>
> 0-25.184.142.139.in-addr.arpa. NS pluto.acrodex.com.
> 0-25.184.142.139.in-addr.arpa. NS nova.acrodex.com.
> 0-25.184.142.139.in-addr.arpa. NS saturn.acrodex.com.
>
> Nova does not exist.
>
> Pluto refuses most questions for 10.0-25.184.142.139.in-addr.arpa except
> if you ask for a PTR, in which case it replies with a bogus question
> section containing 139.0.184.142.in-addr.arpa.
>
> Saturn works OK for most questions, and returns a PTR record if you ask
> for ANY, but if you request a PTR directly it ignores you.
Hmmm…
So, for many years I've wondered this. I've looked a little myself, and spoken
to a few folk, but never gotten a really satisfactory answer -- maybe there
just isn't one…
You often see freaky things like the above (actually, this one is only somewhat
freaky), where nameserver implementation behave in bizarre / insane manners.
For many of these it seems as through the NS is simply bored, and misbehaving
for entertainment purposes ("Whhheee! I'll reply to all A queries with TXT
answers, lets see what they make of that!", or, my favorite, "Whatever folk
ask, I'll reply with a cname containing the query name, but with alternate
labels swapped...…").
For example, even if I tried (well, without much hacking) I cannot figure out
how to duplicate Saturn's behavior…
What is it about the DNS protocol that leads to this? Do folk look at all the
existing auth server offerings and decide "No, don't like those, I'll just
write my own… in haskel!"?
Or is is simply that nameservers themselves are malicious bastards? Are they
all conspiring against us? Is there some very subtle joke that we are not
seeing?
W
>
> Tony.
> --
> f.anthony.n.finch <[email protected]> http://dotat.at/
> Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
> Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
> occasionally poor at first.
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--
There were such things as dwarf gods. Dwarfs were not a naturally religious
species, but in a world where pit props could crack without warning and pockets
of fire damp could suddenly explode they'd seen the need for gods as the sort
of supernatural equivalent of a hard hat. Besides, when you hit your thumb with
an eight-pound hammer it's nice to be able to blaspheme. It takes a very
special and straong-minded kind of atheist to jump up and down with their hand
clasped under their other armpit and shout, "Oh,
random-fluctuations-in-the-space-time-continuum!" or "Aaargh,
primitive-and-outmoded-concept on a crutch!"
-- Terry Pratchett
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