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RFC4620 IPv6 Node Information Queries

RFC4620 IPv6 Node Information Queries. speaker ： Wenping Zhang data ： 2007/04/22. Outline. Introduction Node Information Messages Defined Qtypes Message Processing. Introduction. This document specifies a mechanism for discovering information about names and addresses.

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RFC4620 IPv6 Node Information Queries

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  1. RFC4620 IPv6 Node Information Queries speaker：Wenping Zhang data：2007/04/22

  2. Outline • Introduction • Node Information Messages • Defined Qtypes • Message Processing

  3. Introduction • This document specifies a mechanism for discovering information about names and addresses. • The applicability of these mechanisms is currently limited to diagnostic and debugging tools and network management (e.g., node discovery).

  4. Node Information Messages • Two types of Node Information messages • the NI Query • the NI Reply • They have the same format.

  5. Type 139 - NI Query 140 - NI Reply Code For NI Query 0 - Indicates that the Data field contains an IPv6 address 1 - Indicates that the Data field contains a name 2 - Indicates that the Data field contains an IPv4 For NI Reply 0 - Indicates a successful reply 1 - Indicates that the Responder refuses to supply the answer 2 - Indicates that the Qtype of the Query is unknown to the Responder

  6. Defined Qtypes 1/5 • Qtypes 0, 2, and 3 MUST be supported by any implementation of this protocol. • Qtype 4 SHOULD be supported by any implementation of this protocol on an IPv4/IPv6 dual-stack node and MAY be supported on an IPv6-only node.

  7. Defined Qtypes 2/5 • NOOP • This NI type has no defined flags and never has a Data field. • On transmission, the ICMPv6 Code in a NOOP Query must be set to 1 and the Code in a NOOP Reply must be 0. • On reception of a NOOP Query or Reply, the Code must be ignored.

  8. Defined Qtypes 3/5 • Node Name • The NI Node Name Query requests the fully-qualified or single-component name corresponding to the Subject Address or Name. • The Reply Data has the following format. • TTL (Time to Live) - MUST be zero. Any non-zero value received MUST be treated as zero. • Node Names - The fully-qualified or single-component name or names of the Responder that correspond(s) to the Subject Address or Name, in DNS wire forma.

  9. Defined Qtypes 4/5 • Node Addresses • The NI Node Addresses Query requests some set of the Responder's IPv6 unicast addresses. • The Node Information Address Query has the following format. • G - If set to 1, Global-scope addresses are requested. • S - If set to 1, Site-local addresses are requested. • L - If set to 1, Link-local addresses are requested. • C - If set to 1, IPv4-compatible (now deprecated) and IPv4-mapped addresses are requested. • A - If set to 1, all the Responder's unicast addresses are requested. • T - Defined in a Reply only, indicates that the set of addresses is incomplete for space reasons.

  10. Defined Qtypes 5/5 • IPv4 Address • The NI IPv4 Addresses Query requests some set of the Responder's IPv4 unicast addresses. • The Node Information IPv4 Address Query has the following format. • A - If set to 1, all the Responder's unicast addresses are requested. • T - Defined in a Reply only, indicates that the set of addresses is incomplete for space reasons.

  11. Message Processing • The Querier constructs an ICMP NI Query and sends it to the address from which information is wanted.

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