IANA Considerations for IPv6 Neighbor Discovery Prefix Information Option Flags
draft-ietf-6man-ndpioiana-03

Abstract

The Prefix Information Option in the IPv6 Neighbor Discovery Router Advertisement message defines an 8-bit flag field with two flags defined and the remaining 6 bits reserved (Reserved1). RFC 6275 has defined a new flag from this field without creating a IANA registry or updating RFC 4861. The purpose of this document is to request a new IANA registry for the PIO flags. This document updates RFC 4861.

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1. Introduction

The Prefix Information Option (PIO) in the IPv6 Neighbor Discovery Router Advertisement defines an 8-bit flag field with two flags defined and the remaining 6 bits reserved (Reserved1). RFC 6275 has defined a new flag from this field without creating a IANA registry or updating RFC 4861. The purpose of this document is to to create a new registry for the PIO flags.

2. Current Prefix Information Option flags

Currently, the Neighbor Discovery Protocol Prefix Information Option [RFC4861] contains the following one-bit flags defined in published RFCs:

    0 1 2 3 4 5 6 7
   +-+-+-+-+-+-+-+-+
   |L|A|R|Reserved1|
   +-+-+-+-+-+-+-+-+
        

Figure 1

• L - On-link Flag [RFC4861]
• A - Autonomous Address Configuration Flag [RFC4861]
• R - Router Address Agent Flag [RFC6275]
• Reserved1 - Reserved

3. Updates to RFC4861

This document updates Section 4.6.2 "Prefix Information" of [RFC4861] to point to the new IANA registry that is created in this document.

Specifically: The current list of flags in the Prefix Information Option can be found in IANA-TBD.

4. IANA Considerations

The IANA is requested to create a new registry for IPv6 Neighbor Discovery Prefix Information Option flags. This should include the current flags in the PIO option. The format for the registry is:

   +---------------+---------------------------------+-----------+
   | RA Option Bit | Description                     | Reference |
   +---------------+---------------------------------+-----------+
   | 0             | L - On-link Flag                | [RFC4861] |
   | 1             | A - Autonomous Address          | [RFC4861] |
   |               |     Configuration Flag          |           |
   | 2             | R - Router Address Flag         | [RFC6275] |
   | 3-7           | Reserved                        |           |
   +---------------+---------------------------------+-----------+

        

Figure 2

The assignment of new flags in the PIO option header require Standards Action.

The registry for these flags should be added to: http://www.iana.org/assignments/icmpv6-parameters

5. Security Considerations

This document has no security considerations.

6. Normative References

Author's Address

Table of Contents

• 1. Introduction
• 2. Current Prefix Information Option flags
• 3. Updates to RFC4861
• 4. IANA Considerations
• 5. Security Considerations
• 6. Normative References
• Author's Address