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- Newsgroups: comp.protocols.tcp-ip.domains
- Path: sparky!uunet!uunet.ca!smd
- From: smd@uunet.ca (Sean Doran)
- Subject: Re: Why not automatically do reverse domains?
- References: <NELSON.92Dec8111713@cheetah.clarkson.edu> <1gr3hjINNnjk@uniwa.uwa.edu.au> <1992Dec21.195422.19764@eecs.nwu.edu> <1hi0l5INNeke@plts.uucp>
- Organization: UUNET Canada
- Date: Wed, 30 Dec 1992 07:30:10 GMT
- Message-ID: <C02A6C.1oK@uunet.ca>
- Distribution: inet
- Lines: 51
-
- tal@plts.uucp (Tom Limoncelli) writes:
-
- >bind 4.8.3 works fine with this. Am I really breaking the rules by
- >having a SOA for warren.mentorg.com as well as "sdl.warren.mentorg.com
- >IN CNAME warren.mentorg.com"?
-
- It's debatable, but it'll work so long as you remember the trailling
- dots :), and so long as sdl.warren.mentorg.com. isn't the target of an
- MX RR somewhere.
-
- There are lots of zones out there that do much the same thing.
-
- Personally, however, I prefer the following boilerplate:
-
- @ IN SOA ns.x.y.z. hostmaster.ns.x.y.z. (
- ...
- )
- IN NS ns.x.y.z.
- IN NS ns.foo.net.
- IN A 128.1.1.1
- IN MX 10 mail.x.y.z.
- IN MX 20 mail.foo.net.
-
- ; this MUST have an A record (and also a glue A RR in the parent zone)
- ns IN A 128.1.1.1
- IN MX 10 mail.x.y.z.
- IN MX 20 mail.foo.net.
-
- ; this MUST have an A record
- mail IN A 128.1.1.1
- IN MX 10 mail.x.y.z.
- IN MX 20 mail.foo.net.
-
- ; and instead of "sdl IN CNAME x.y.z.", we follow the trend...
- sdl IN A 128.1.1.1
- IN MX 10 mail.x.y.z.
- IN MX 20 mail.foo.net.
-
-
- The reasoning here is that I don't want sdl to have an SOA RR or a set
- of NS RRs associated with it. The only thing that needs doing now is
- the appropriate PTR RR in 1.128.in-addr.arpa., where (I suppose) you
- would want to have:
-
- ;...
- 1.1 IN PTR x.y.z.
-
- It's a little more work (but not too much), but you avoid all sorts of
- potential nastinesses you might run into using just a CNAME RR.
-
- Sean.
-