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Status: Verified (1)

RFC 2136, "Dynamic Updates in the Domain Name System (DNS UPDATE)", April 1997

Note: This RFC has been updated by RFC 3007, RFC 4035, RFC 4033, RFC 4034

Source of RFC: dnsind (int)

Errata ID: 4469
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Mark Andrews
Date Reported: 2015-09-09
Verifier Name: Brian Haberman
Date Verified: 2015-09-14

Section 3.4.2.2 says: 

   3.4.2.2. Any Update RR whose CLASS is the same as ZCLASS is added to
   the zone.  In case of duplicate RDATAs (which for SOA RRs is always
   the case, and for WKS RRs is the case if the ADDRESS and PROTOCOL
   fields both match), the Zone RR is replaced by Update RR.  If the
   TYPE is SOA and there is no Zone SOA RR, or the new SOA.SERIAL is
   lower (according to [RFC1982]) than or equal to the current Zone SOA
   RR's SOA.SERIAL, the Update RR is ignored.  In the case of a CNAME
   Update RR and a non-CNAME Zone RRset or vice versa, ignore the CNAME
   Update RR, otherwise replace the CNAME Zone RR with the CNAME Update
   RR.

It should say:

   3.4.2.2. Any Update RR whose CLASS is the same as ZCLASS is added to
   the zone.  In case of duplicate RDATAs (which for SOA RRs is always
   the case, and for WKS RRs is the case if the ADDRESS and PROTOCOL
   fields both match), the Zone RR is replaced by Update RR.  If the
   TYPE is SOA and there is no Zone SOA RR, or the new SOA.SERIAL is
   lower (according to [RFC1982]) than or equal to the current Zone SOA
   RR's SOA.SERIAL, the Update RR is ignored.  In the case of a CNAME
   Update RR and a non-CNAME Zone RRset or vice versa, ignore the
   Update RR, otherwise replace the CNAME Zone RR with the CNAME Update
   RR.

Notes:

In the vice versa case it it not a CNAME Update RR, just a plain Update RR. Removing the word "CNAME" make the sentence cover both cases as intended.

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