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I get error messages like "multiple RRs of singleton type" and "CNAME and other data" when transferring a zone?
Author: ISC Support Reference Number: AA-00297 Views: 13883 Created: 2011-05-13 20:49 Last Updated: 2017-01-11 08:38 0 Rating/ Voters

These indicate a malformed master zone. You can identify the exact records involved by transferring the zone using dig then running named-checkzone on it.

CHARSET=ASCII IDN_DISABLE=1 dig +onesoa axfr @master-server > tmp

named-checkzone tmp

A CNAME record cannot exist with the same owner name as another record except for its RRSIG and the DNSSEC records which prove non-existence of other records (NSEC).

RFC 1034, Section 3.6.2: "If a CNAME RR is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different. This rule also insures that a cached CNAME can be used without checking with an authoritative server for other RR types."

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