From: "Eric D. Williams" <eric(_at_)infobro(_dot_)com>
...
That seems to be based on the mistaken notion that there can be only
a single PTR RR per IP address.
There can only be one canonical reverse mapping for an IP address.
Where does the word "canonical" appear in RFC 1034 in connection with
PTR RRs?
There can
be multiple forward A records. That is not to say the a PTR record can't be
dynamically configured. However, yes that is the case for any instance for a
transient or permenant assignment of a PTR RR AFAIK.
100 IN PTR domain1.com.
IN PTR domain2.com.
does not work AFAIK, I will give it a shot.
Those are quite similar to the lines that temporarily cause this:
% nslookup -d 192.188.61.4
...
QUESTIONS:
4.61.188.192.in-addr.arpa, type = PTR, class = IN
ANSWERS:
-> 4.61.188.192.in-addr.arpa
name = andesite.rhyolite.com
ttl = 86400 (1D)
-> 4.61.188.192.in-addr.arpa
name = ns3.rhyolite.com
ttl = 86400 (1D)
...
See also http://www.google.com/search?q=%22multiple+ptr%22+dns
Vernon Schryver vjs(_at_)rhyolite(_dot_)com
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