12. IANA Considerations

This document registers three new ND option types under the subregistry "IPv6 Neighbor Discovery Option Formats":

• Address Registration Option (33)
• 6LoWPAN Context Option (34)
• Authoritative Border Router Option (35)

The document registers two new ICMPv6 "type" numbers under the subregistry "ICMPv6 'type' Numbers":

• Duplicate Address Request (157)
• Duplicate Address Confirmation (158)

IANA has also created a new subregistry for the Status values of the Address Registration Option, under the ICMPv6 parameters registry.

Address Registration Option Status Values registry:

• Possible values are 8-bit unsigned integers (0..255).
• Registration procedure is "Standards Action" [RFC5226].
• Initial allocation is as indicated in Table 2:

Status	Description
0	Success
1	Duplicate Address
2	Neighbor Cache Full
3-255	Allocated using Standards Action [RFC5226]

Table 2