Still Falling Down

Still Falling Down

April, 2008

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Read the RFCs! That’s why they’re there!

Once again, I’ve been told that an IP address can only have one PTR resource record.
We got a new Internet connection in the office, and I requested 2 PTR records for an IP address on that connection to provide reverse address lookup. Can’t have email rejected for lack of a reverse IP entry. After being ignored by Support for 2 days, I sent the request to the Account Manager, who said the request was rejected because I had 2 hostnames for one IP address, and that’s not allowed.

I’ve heard this almost every time I’ve set up a new Internet connection since 1996. I can’t believe there are techs who still think this is true.

From RFC2181 (http://www.ietf.org/rfc/rfc2181.txt):

10.2. PTR records

   Confusion about canonical names has lead to a belief that a PTR
   record should have exactly one RR in its RRSet.  This is incorrect,
   the relevant section of RFC1034 (section 3.6.2) indicates that the
   value of a PTR record should be a canonical name.  That is, it should
   not be an alias.  There is no implication in that section that only
   one PTR record is permitted for a name.  No such restriction should
   be inferred.

Let’s go folks. Just because Jon is dead, it doesn’t mean that RFCs don’t matter anymore.

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