draft-ietf-6man-ra-pref64-07.txt   draft-ietf-6man-ra-pref64-08.txt 
IPv6 Maintenance L. Colitti IPv6 Maintenance L. Colitti
Internet-Draft J. Linkova Internet-Draft J. Linkova
Intended status: Standards Track Google Intended status: Standards Track Google
Expires: May 5, 2020 November 2, 2019 Expires: May 30, 2020 November 27, 2019
Discovering PREF64 in Router Advertisements Discovering PREF64 in Router Advertisements
draft-ietf-6man-ra-pref64-07 draft-ietf-6man-ra-pref64-08
Abstract Abstract
This document specifies a Neighbor Discovery option to be used in This document specifies a Neighbor Discovery option to be used in
Router Advertisements to communicate NAT64 prefixes to hosts. Router Advertisements to communicate NAT64 prefixes to hosts.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 5, 2020. This Internet-Draft will expire on May 30, 2020.
Copyright Notice Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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Figure 1: NAT64 Prefix Option Format Figure 1: NAT64 Prefix Option Format
Fields: Fields:
Type 8-bit identifier of the PREF64 option type as assigned by Type 8-bit identifier of the PREF64 option type as assigned by
IANA: TBD IANA: TBD
Length 8-bit unsigned integer. The length of the option (including Length 8-bit unsigned integer. The length of the option
the Type and Length fields) is in units of 8 octets. The (including the Type and Length fields) is in units of 8
sender MUST set the length to 2. The receiver MUST ignore octets. The sender MUST set the length to 2. The receiver
the PREF64 option if the length field value is not 2. MUST ignore the PREF64 option if the length field value is
not 2.
Scaled 13-bit unsigned integer. The maximum time in units of 8 Scaled 13-bit unsigned integer. The maximum time in units of 8
Lifetime seconds over which this NAT64 prefix MAY be used. The value Lifetime seconds over which this NAT64 prefix MAY be used. The value
of the Scaled Lifetime field SHOULD by default be set to the of the Scaled Lifetime field SHOULD by default be set to the
lesser of 3 x MaxRtrAdvInterval divided by 8, or 8191. The lesser of 3 x MaxRtrAdvInterval divided by 8, or 8191. The
receiver MUST multiply the Scaled Lifetime value by 8 (for receiver MUST multiply the Scaled Lifetime value by 8 (for
example, by logical left shift) to calculate the maximum example, by logical left shift) to calculate the maximum
time in seconds the prefix MAY be used. Lifetime of 0 time in seconds the prefix MAY be used. Lifetime of 0
indicates that the prefix SHOULD NOT be used anymore. Router indicates that the prefix SHOULD NOT be used anymore. Router
vendors SHOULD allow administrators to specify non-zero vendors SHOULD allow administrators to specify non-zero
lifetime values which are not divisible by 8. In such cases lifetime values which are not divisible by 8. In such cases
the router SHOULD round the provided value up to the lesser the router SHOULD round the provided value up to the lesser
of nearest integer divisible by 8, or 65528 and divide the of nearest integer divisible by 8, or 65528 and divide the
result by 8 (or just perform a logical right-shift by 3) and result by 8 (or just perform a logical right-shift by 3) and
set the Scaled Lifetime field to the resulting value. set the Scaled Lifetime field to the resulting value. If
such a non-zero lifetime value to be divided by 8 (to be
subjected to a logical right-shift by 3) is less than 8 then
the Scaled Lifetime field SHOULD by default be set to 1.
PLC 3-bit unsigned integer. This field encodes the NAT64 Prefix PLC 3-bit unsigned integer. This field encodes the NAT64 Prefix
(Prefix Length defined in [RFC6052]. The PLC field values 0, 1, 2, (Prefix Length defined in [RFC6052]. The PLC field values 0, 1, 2,
Length 3, 4 and 5 indicate the NAT64 prefix length of 96, 64, 56, Length 3, 4 and 5 indicate the NAT64 prefix length of 96, 64, 56,
Code) 48, 40 and 32 bits respectively. The receiver MUST ignore Code) 48, 40 and 32 bits respectively. The receiver MUST ignore
the PREF64 option if the prefix length code field is not set the PREF64 option if the prefix length code field is not set
to one of those values. to one of those values.
Highest 96-bit unsigned integer. Contains bits 0 - 95 of the NAT64 Highest 96-bit unsigned integer. Contains bits 0 - 95 of the NAT64
96 bits prefix. 96 bits prefix.
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