DNS TIMEOUT Resource Record
draft-ietf-dnsop-update-timeout-00
DNSOP Working Group T.J. Pusateri
Internet-Draft T. Wattenberg
Intended status: Standards Track Unaffiliated
Expires: 25 November 2020 24 May 2020
DNS TIMEOUT Resource Record
draft-ietf-dnsop-update-timeout-00
Abstract
This specification defines a new DNS TIMEOUT resource record (RR)
that associates a lifetime with one or more zone resource records.
It is intended to be used to transfer resource record lifetime state
between a zone's primary and secondary servers and to store lifetime
state during server software restarts.
Status of This Memo
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This Internet-Draft will expire on 25 November 2020.
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Pusateri & Wattenberg Expires 25 November 2020 [Page 1]
Internet-Draft TIMEOUT Resource Record May 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Sources of TIMEOUT Expiry Time . . . . . . . . . . . . . . . 3
4. Common Usage Patterns . . . . . . . . . . . . . . . . . . . . 4
4.1. TIMEOUT records vs. Update Leases . . . . . . . . . . . . 5
4.2. Testing for TIMEOUT . . . . . . . . . . . . . . . . . . . 6
5. Resource Record Composition . . . . . . . . . . . . . . . . . 6
5.1. Represented Record Type . . . . . . . . . . . . . . . . . 6
5.2. Represented Record Count . . . . . . . . . . . . . . . . 7
5.3. Method Identifiers . . . . . . . . . . . . . . . . . . . 7
5.3.1. Method Identifier 0: NO METHOD . . . . . . . . . . . 8
5.3.2. Method Identifier 1: MD-SHA256-128 . . . . . . . . . 8
5.4. Expiry Time . . . . . . . . . . . . . . . . . . . . . . . 8
6. TIMEOUT RDATA Wire Format . . . . . . . . . . . . . . . . . . 9
7. Server Behavior . . . . . . . . . . . . . . . . . . . . . . . 10
7.1. Primary Server Behavior . . . . . . . . . . . . . . . . . 10
7.2. Secondary Server Behavior . . . . . . . . . . . . . . . . 11
8. TIMEOUT RDATA Presentation Format . . . . . . . . . . . . . . 11
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
10. Security Considerations . . . . . . . . . . . . . . . . . . . 13
11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 13
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
12.1. Normative References . . . . . . . . . . . . . . . . . . 13
12.2. Informative References . . . . . . . . . . . . . . . . . 14
Appendix A. Example TIMEOUT resource records . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 17
1. Introduction
DNS Update [RFC2136] provides a mechanism to dynamically add/remove
DNS resource records to/from a zone. When a resource record is
dynamically added, it remains in the zone until it is removed
manually or via a subsequent DNS Update. The context of a dynamic
update may provide lifetime hints for the updated records (such as
the EDNS(0) Update Lease option [I-D.sekar-dns-ul]), however, this
lifetime is not communicated to secondary servers and will not
necessarily endure through server software restarts. This
specification defines a new DNS TIMEOUT resource record that
associates lifetimes with one or more resource records with the same
owner name, type, and class that can be transferred to secondary
servers through normal AXFR [RFC5936], IXFR [RFC1995] transfer
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