DNS woes (was Re: 50Hz vs 60Hz fixed drive speed ?)

From: der Mouse <mouse_at_Rodents.Montreal.QC.CA>
Date: Wed Feb 18 12:55:01 2004

>> And good for them, I say. Too many places have been sloppy about
>> rDNS for too long.
> I agree, to a point. The powers that be FINALLY required reverse
> entries for everything, utilized or not.

There certainly is no such de-facto requirement, whatever there may be
de-jure. Just now, for example, I did traceroutes to 218.16.120.204
and 221.4.203.28, two Chinese addresses I found involved in spam
relatively recently. In each case, as soon as the trace hit Chinese
address space, the routers had no rDNS at all - not just mismatched
with forward DNS, but no names in sight.

>> Provides aliases in the sense of returning multiple PTRs, or in the
>> sense of passing through a CNAME?
> If the reverse lookup returns a real fixed hostname that matches the
> forward lookup, but it still ALSO lists aliases, they refuse it.

Lists aliases in the sense of returning multiple PTRs, or in the sense
of passing through a CNAME?

If the former, do the other names also forward-resolve to the address
in question?

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Received on Wed Feb 18 2004 - 12:55:01 GMT