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- Newsgroups: comp.protocols.tcp-ip.domains
- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!swrinde!gatech!psuvax1!atlantis.psu.edu!barr
- From: barr@pop.psu.edu (David Barr)
- Subject: Re: CNAME records and MX/NS records
- Message-ID: <fn51H7&8_b@atlantis.psu.edu>
- Sender: news@atlantis.psu.edu (Usenet)
- Organization: Penn State Population Research Institute
- References: <1993Jan11.192147.8578@maths.tcd.ie> <1993Jan11.203058.28778@mp.cs.niu.edu> <1isteb$nmc@agate.berkeley.edu>
- Date: Tue, 12 Jan 93 02:05:12 GMT
- Lines: 50
-
- In article <1isteb$nmc@agate.berkeley.edu> cliff@garnet.berkeley.edu (Cliff Frost) writes:
- >It appears reasonable (to me) if you think of providing these services on
- >multiple hosts, so that if one host goes down hard the other one is still
- >providing the function. Eg:
- >
- >; sam and mary are identically configured for processing email:
- >
- > sam.foo.bar. A 1.2.3.4
- > mary.foo.bar. A 1.2.4.4
- > mail.foo.bar. A 1.2.3.4
- > A 1.2.4.4
-
- Ack! I feel faint!!
-
- How is this different than:
-
- sam.foo.bar. A 1.2.3.4
- mary.foo.bar. A 1.2.4.4
- client.foo.bar. A 1.2.3.5
- MX 5 sam.foo.bar.
- MX 10 mary.foo.bar.
-
- or even:
-
- client.foo.bar. MX 5 sam.foo.bar.
- client.foo.bar. MX 5 mary.foo.bar.
-
- >; fred and betsy are running identical authoritative nameservers:
- >
- > fred.foo.bar. A 1.2.3.5
- > betsy.foo.bar. A 1.2.4.5
- > ns.foo.bar. A 1.2.3.5
- > A 1.2.4.5
-
- Why??? How often do you change your glue records? Also, your
- parent domain is going to have to change his IP addresses for the glue
- records anyway, why confuse things like this?
-
- >From experience we can say it works well for mail and less wonderfully (but
- >still useful) for nameservice. The reason it is less useful for nameservice
- >is the slew of software out there which is configurable for one and only one
- >nameserver IP address.
-
- This may be true for stub resolvers, but how many nameservers
- only look at the first NS record?
-
- --Dave
- --
- System Administrator, Population Research Institute barr@pop.psu.edu
- What if there was no such thing as a hypothetical question?
-