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- Newsgroups: comp.protocols.tcp-ip.domains
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sdd.hp.com!cs.utexas.edu!torn!newshub.ccs.yorku.ca!yorku.ca!davecb
- From: davecb@nexus.yorku.ca (David Collier-Brown)
- Subject: Re: Why not automatically do reverse domains?
- Message-ID: <davecb.724200947@yorku.ca>
- Sender: news@newshub.ccs.yorku.ca (USENET News System)
- Organization: York University
- References: <NELSON.92Dec8111713@cheetah.clarkson.edu> <CKD.92Dec8180024@loiosh.eff.org> <1992Dec11.172920.3011@eecs.nwu.edu>
- Date: Sat, 12 Dec 1992 22:55:47 GMT
- Lines: 45
-
-
-
- RN> (Russ Nelson <nelson@sun.soe.clarkson.edu>) writes:
- RN> Why doesn't BIND automatically generate a PTR record for every A
- RN> record it sees? All the nameserver tools I've seen perform that
- RN> function, why doesn't BIND? Is there some subtlety that doesn't
- RN> meet my eye?
-
- phil@pex.eecs.nwu.edu (William LeFebvre) writes:
- |Another problem is hosts with more than one name. Only one name
- |can be canonical, and that is the one that is named in the PTR
-
- That's actually a very common situation: we have lots of
- ``service-names'' for machines here at Ork which we do with CNAME
- records, but there is one case that forces us back to extra A-records:
- broken mailers!
-
- A certain major vendor ships a sendmail that, unless you're running
- a certain network lookup service, fails to honor MX records. Many
- users don't understand the undesirability of this, and dont switch to
- an (optional) mx-capable sendmail.
- This is usually known as ``sendfail''.
- To avoid it, our mailhubs have extra A records, along with the
- usual MX records, thusly:
- ccs.yorku.ca. 86400 A 130.63.7.3
- ccs.yorku.ca. 86400 MX 10 ccs.yorku.ca.
- This has the usefull side-effect of making finger queries to
- ccs.yorku.ca produce the expected results.
-
- However, ccs.yorku.ca isn't the **real** real name of the machine:
- it's actually draco.ccs.yorku.ca, abd that's what following the PTR
- record will tell you.
-
- I've been tempted for some time to write a preprocessor for bind
- to support an ASERVICE record as well as an A. A's would cause
- PTRs. ASERVICEs wouldn't.
-
- --dave (some day, when I get caught up on
- another few hundred projects...) c-b
-
- --
- David Collier-Brown, | davecb@CCS.YorkU.CA | lethe!dave
- 72 Abitibi Ave., |
- Willowdale, Ontario, | York Postmaster and
- CANADA. 416-223-8968 | occasional sendfail(8) consultant.
-