How do people do their own RDNS without a full class C ?
Kyle R. Green
kyle at kgreen.org
Wed Jan 9 03:48:07 UTC 2002
On Tuesday, January 8, 2002, at 10:36 PM, Patrick Thomas wrote:
> Yes, but the problem is, I am running many many domains out of my 64
> addresses, so it is not possible for them to simply add in generic PTRs
> for each IP all pointing to the same .yourdomain.com ...
Well, doesn't really matter:
[Please note the ending dots that I forgot in the previous examples.]
0.168.192.in-addr.arpa:
5 IN CNAME 192-168-0-5.yourdomain.com.
6 IN CNAME 192-168-0-6.yourdomain.com.
7 IN CNAME 192-168-0-7.yourdomain.com.
yourdomain.com:
192-168-0-5 IN PTR www.yourdomain.com.
192-168-0-6 IN PTR www.someotherdomain.com.
192-168-0-7 IN PTR www.yetanotherdomain.com.
The remote clients/servers will query the server authoritative for
0.168.192.in-addr.arpa to find out what the PTR for 5.168.192.in-
addr.arpa is. The CNAME will be encountered, resulting in another
request to yourdomain.com's nameservers to find out what the PTR for
192-168-0-5.yourdomain.com is. www.yourdomain.com. will be returned.
It's a cheap hack that works, although I can't guarantee that it's 100%
RFC compliant.
It probably would never get the ISC Seal of Approval(TM).
--
Kyle R. Green
kyle at kgreen.org
Delores breezed along the surface of her life like a flat stone forever
skipping along smooth water, rippling reality sporadically but oblivious
to it consistently, until she finally lost momentum, sank, and due to an
overdose of flouride as a child which caused her to suffer from chronic
apathy, doomed herself to lie forever on the floor of her life as
useless as an appendix and as lonely as a five-hundred pound barbell in
a steroid-free fitness center.
-- Winning sentence, 1990 Bulwer-Lytton bad fiction contest.
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