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- Newsgroups: comp.mail.sendmail
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!saimiri.primate.wisc.edu!ames!ncar!claven!woods
- From: woods@claven.ucar.edu (Greg Woods)
- Subject: Re: sendmail name canonicalization problems
- Message-ID: <1992Dec17.173447.5199@claven.ucar.edu>
- Organization: Scientific Computing Division/NCAR Boulder, CO
- References: <1992Dec16.234601.6354@ssigv.UUCP>
- Date: Thu, 17 Dec 1992 17:34:47 GMT
- Lines: 21
-
- In article <1992Dec16.234601.6354@ssigv.UUCP> gdonl@sunrise.ssi1.com (Don Lewis) writes:
- >The second solution would be to
- >define A records pointing to the mail hosts for each site. This
- >solution has the disadvantage of breaking the strict one to one mapping
- >of A and PTR records in our DNS database.
-
- Is there a real reason why this is a problem? I have a number of A records
- that point to invidual hosts that have distributed MX records. This is
- the only way I have found to direct mail to a PARTICULAR host in an MX
- group. For example, our main post office address (ncar.ucar.edu) has 4
- different MX records, pointing to other machines that also maintain the
- aliases database, so that our mail going in and out does not get blocked
- when a single host goes down, or when the T3 line between our two
- sites goes down, users at the "remote" site can still send to
- "username@ncar" and have it delivered internally at that site.
- Without a second A record, there is then no way to direct mail
- to the ncar.ucar.edu machine specifically. So I have multiple A
- records for the same IP address. This has never caused any problems.
- Is there some reason why I should be worried about this?
-
- --Greg
-