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Status: Verified (2)

RFC2308, "Negative Caching of DNS Queries (DNS NCACHE)", March 1998

Source of RFC: dnsind (int)

Errata ID: 461

Status: Verified
Type: Editorial

Reported By: Hideshi Enokihara
Date Reported: 2006-02-01
Verifier Name: Brian Haberman
Date Verified: 2012-05-01

Section 7.2 says:

7.2 Dead / Unreachable Server (OPTIONAL)

   Dead / Unreachable servers are servers that fail to respond in any
   way to a query or where the transport layer has provided an
   indication that the server does not exist or is unreachable.  A
   server may be deemed to be dead or unreachable if it has not
   responded to an outstanding query within 120 seconds.

   Examples of transport layer indications are:

      ICMP error messages indicating host, net or port unreachable.
      TCP resets
      IP stack error messages providing similar indications to those above.

   A server MAY cache a dead server indication.  If it does so it MUST
   NOT be deemed dead for longer than five (5) minutes.  The indication
   MUST be stored against query tuple <query name, type, class, server
   IP address> unless there was a transport layer indication that the
   server does not exist, in which case it applies to all queries to
   that specific IP address.

It should say:

7.2 Dead / Unreachable Server (OPTIONAL)

   Dead / Unreachable servers are servers that fail to respond in any
   way to a query or where the transport layer has provided an
   indication that the server does not exist or is unreachable.  A
   server may be deemed to be dead or unreachable if it has not
   responded to an outstanding query within 120 seconds.

   Examples of transport layer indications are:

      ICMP error messages indicating host, net or port unreachable.
      TCP resets
      IP stack error messages providing similar indications to those above.

   A resolver MAY cache a dead server indication.  If it does so it MUST
   NOT be deemed dead for longer than five (5) minutes.  The indication
   MUST be stored against query tuple <query name, type, class, server
   IP address> unless there was a transport layer indication that the
   server does not exist, in which case it applies to all queries to
   that specific IP address.

Notes:

Last sentence says, "A server MAY cache a dead server indication.".
But, this "server" is typo, I think.
This "server" should be "resolver" because section 7.1's last sentence uses "resolver".

Errata ID: 4489

Status: Verified
Type: Editorial

Reported By: Wes Hardaker
Date Reported: 2015-09-29
Verifier Name: Brian Haberman
Date Verified: 2015-10-14

In the References


It should say:

ADD:

[RFC2136]  P. Vixie, Ed., S. Thomson, Y. Rekhter, J. Bound, "Dynamic
           Updates in the Domain Name System (DNS UPDATE)", 
           RFC 2136, April 1997.

-------

OR:  define SERVFAIL inside of the terminology section (section 1):

"SERVFAIL" - a name for the "Server failure" (2) RCODE described in
[RFC1035 Section 4.1.1].

Notes:

Section 2.1.1 uses the term SERVFAIL to reference DNS RCODE 2, but this term isn't defined in the document nor in the referenced documents. It's first defined in 2136 and thus the two options available are to either add a reference to 2136 or to add a definition of SERVFAIL to the document in the terminology section.

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