| Network Working Group | O. Trøan |
| Internet-Draft | Cisco Systems |
| Updates: 4861 (if approved) | January 10, 2018 |
| Intended status: Standards Track | |
| Expires: July 14, 2018 |
IPv6 ND PIO Flags IANA considerations
draft-ietf-6man-ndpioiana-02
The Prefix Information Option 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 request that IANA to create a new registry for the PIO flags to avoid potential conflict in the use of these flags. This document updates RFC 4861.
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The Prefix Information Option 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 request that IANA to create a new registry for the PIO flags to avoid potential conflict in the use of these flags.
Currently, the NDP Prefix Information Option contains the following one-bit flags defined in published RFCs:
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
|L|A|R|Reserved1|
+-+-+-+-+-+-+-+-+
Figure 1
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].
The IANA is requested to create a new registry for IPv6 ND 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] |
+---------------+---------------------------------+-----------+
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
This document has no security considerations.
| [RFC4861] | Narten, T., Nordmark, E., Simpson, W. and H. Soliman, "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861, DOI 10.17487/RFC4861, September 2007. |
| [RFC6275] | Perkins, C., Johnson, D. and J. Arkko, "Mobility Support in IPv6", RFC 6275, DOI 10.17487/RFC6275, July 2011. |