Internet Engineering Task Force (IETF) J. Arkko Request for Comments: 5872 Ericsson Updates: 5191 A. Yegin Category: Standards Track Samsung ISSN: 2070-1721 May 2010
IANA Rules for the Protocol for Carrying Authentication for Network Access (PANA)
This document relaxes the IANA rules for the Protocol for Carrying Authentication for Network Access (PANA).
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
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This document relaxes the IANA rules for the Protocol for Carrying Authentication for Network Access (PANA) [RFC5191]. Rules for the following protocol fields, all defined in [RFC5191], are affected:
o Message Types
o Message Flags
o Attribute-Value Pair (AVP) Flags
o Result-Code AVP Values
o Termination-Cause AVP Values
The rationale for this update is that there can be situations in which it makes sense to grant an allocation under special circumstances. At the time of this writing, the IETF is in the process of approving one such allocation. By changing the current IANA rules to allow for IESG Approval [RFC5226] as well, it has become possible for the Internet Engineering Steering Group (IESG) to consider an allocation request, even if it does not fulfill the default rule. For instance, an experimental protocol extension could perhaps deserve an allocation from a field of reserved bits, as long as a sufficient number of bits still remain for other purposes, and the PANA community is happy with such allocation.
IANA has updated the registries related to PANA Message Types, Message Flags, AVP Flags, Result-Code AVP Values, and Termination- Cause AVP Values, as specified below. All other PANA IANA registries are to remain unchanged.
The Message Types namespace is used to identify PANA messages. Value 0 is not used and is not assigned by IANA. The range of values from 1 - 65,519 are for permanent, standard Message Types, allocated by IETF Review or IESG Approval [RFC5226]. Previously, the rule for this range was allocation by IETF Review only. [RFC5191] defined the range of values from 1 - 4. The same Message Type is used for both the request and the answer messages, except for type 1. The Request bit distinguishes requests from answers.
Arkko & Yegin Standards Track [Page 2]
RFC 5872 PANA IANA Rules May 2010
The range of values from 65,520 - 65,535 (hexadecimal values 0xfff0 - 0xffff) is reserved for experimental messages. As these codes are only for experimental and testing purposes, no guarantee is made for interoperability between the communicating PANA Client (PaC) and PANA Authentication Agent (PAA) using experimental commands, as outlined in [RFC3692].
There are 16 bits in the Flags field of the PANA message header. Section 6.2 of [RFC5191] assigned bit 0 ('R'), 1 ('S'), 2 ('C'), 3 ('A'), 4 ('P'), and 5 ('I'). Allocations from the remaining free bits in the PANA header Flag field are made via Standards Action or IESG Approval [RFC5226]. Previously, the rule for these bits was allocation by Standards Action only.
There are 16 bits in the AVP Flags field of the AVP header, defined in Section 6.3 of [RFC5191]. That RFC also assigned bit 0 ('V'). The remaining bits are assigned via Standards Action or IESG Approval [RFC5226]. Previously, the rule for these bits was allocation by Standards Action only.
This specification does not change the security properties of PANA.
However, a few words are necessary about the use of the experimental code points defined in Section 2.1. Potentially harmful side effects from the use of the experimental values need to be carefully evaluated before deploying any experiment across networks that the owner of the experiment does not entirely control. Guidance given in [RFC3692] about the use of experimental values needs to be followed.