IPv6 CE Routers LAN Prefix Delegation
draft-winters-v6ops-cpe-lan-pd-00
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|
|---|---|---|---|
| Author | Timothy Winters | ||
| Last updated | 2022-11-17 | ||
| Replaced by | draft-ietf-v6ops-cpe-lan-pd, draft-ietf-v6ops-cpe-lan-pd | ||
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draft-winters-v6ops-cpe-lan-pd-00
Internet Engineering Task Force T. Winters
Internet-Draft QA Cafe
Updates: 7084 (if approved) 17 November 2022
Intended status: Informational
Expires: 21 May 2023
IPv6 CE Routers LAN Prefix Delegation
draft-winters-v6ops-cpe-lan-pd-00
Abstract
This document defines requirements for IPv6 CE Routers to support
DHCPv6 Prefix Delegation for redistributing any unused prefix(es)
that were delegated to the IPv6 CE Router. This document updates RFC
7084.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 21 May 2023.
Copyright Notice
Copyright (c) 2022 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights
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provided without warranty as described in the Revised BSD License.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. Architecture . . . . . . . . . . . . . . . . . . . . . . . . 3
5. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 3
6. Security Considerations . . . . . . . . . . . . . . . . . . . 4
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4
8. Acknowledements . . . . . . . . . . . . . . . . . . . . . . . 4
9. Normative References . . . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
This document defines DHCPv6 Prefix Delegation in IPv6 CE Routers
([RFC7084]) in order to properly utilize the IPv6 prefixes assigned
by service providers. Many ISP will assign a prefix larger then /64
to the CE Router as recommended in [RFC6177]. If a IPv6 CE Router
doesn't support IA_PD on the LAN it will not be able to assign any
prefixes beyond itself limiting the usefulness of assigning prefixes
larger then /64. Supporting IA_PD on the LAN interfaces will allow
for those prefixes to be distributed into a network to be useable.
2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
This document also makes use of internal conceptual variables to
describe protocol behavior and external variables that an
implementation must allow system administrators to change. The
specific variable names, how their values change, and how their
settings influence protocol behavior are provided to demonstrate
protocol behavior. An implementation is not required to have them in
the exact form described here, as long as its external behavior is
consistent with that described in this document.
3. Terminology
The following terminology is defined for this document.
* IPv6 CE Router: A router intended for home or small-office use
that forwards packets explicitly addressed to itself as defined in
[RFC7084].
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* Internet Service Provider (ISP): An entity that provides access to
the Internet. In this document, a service provider specifically
offers Internet access using IPv6, and may also offer IPv4
Internet access. The service provider can provide such access
over a variety of different transport methods such as DSL, cable,
wireless, and others.
4. Architecture
+-----------+
| Service |
| Provider |
| Router |
+-----+-----+
|
|
| Customer
| Internet Connection
|
+-----v-----+
| IPv6 |
| CE |
| Router |
+-----+-----+
|
+----+-+-------+
| |
| |
+---+----+ +-----+------+
| IPv6 | | |
| Host | | Router |
| | | |
+--------+ +------------+
5. Requirements
The IPv6 CE Router distributes configuration information obtained
during WAN interface provisioning to IPv6 hosts and routers. A
router based on [RFC7084] previously would only address IPv6 hosts,
this update to allow for addressing and routing of routers.
LAN Prefix Delegation (PD) Requirements
LPD-1: The IPv6 CE Router MUST support DHCPv6 server capable of IPv6
prefix assignment according to [RFC8415] (Idenity Association for
Prefix Delegation (IA_PD) option).
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LPD-2: The IPv6 CE Router MUST assign addresses from the delegated
prefix to the number of interfaces. If not enough addresses are
available the IPv6 CE Router SHOULD log a system management error.
LPD-3: After interface address assignment the IPv6 CE Router MUST
make the remaining IPv6 prefixes available to other Routers via
Prefix Delegation
LPD-4: The IPv6 CE Router MUST give out a IA_PD of the remaining
prefixes with a IA_PD size of 64.
LPD-5: The IPv6 CE Router MUST install a route to the IA_PD assigned
with a next-hop of the IPv6 node assigned the address.
LPD-6: If a IPv6 CE Router recieves IPv6 prefixes of size 64 it MUST
enable delegating relay according to [RFC8987]. The MUST forward all
the DHCPv6 Relay messages to the All_DHCP_Relay_Agents_and_Servers
multicast address.
6. Security Considerations
This document does not add any new security considerations beyond
those mentioned in Section 4 of [RFC8213] and Section 22 of
[RFC8415].
7. IANA Considerations
This document makes no request of IANA.
8. Acknowledements
Thanks to the following people (in alphabetical order) for their
guidance and feedback: Marion Dillon, Esko Dijk, Ted Lemon, Michael
Richardson.
9. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC6177] Narten, T., Huston, G., Roberts, L., and RFC Publisher,
"IPv6 Address Assignment to End Sites", BCP 157, RFC 6177,
DOI 10.17487/RFC6177, March 2011,
<https://www.rfc-editor.org/info/rfc6177>.
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[RFC7084] Singh, H., Beebee, W., Donley, C., Stark, B., and RFC
Publisher, "Basic Requirements for IPv6 Customer Edge
Routers", RFC 7084, DOI 10.17487/RFC7084, November 2013,
<https://www.rfc-editor.org/info/rfc7084>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8213] Volz, B., Pal, Y., and RFC Publisher, "Security of
Messages Exchanged between Servers and Relay Agents",
RFC 8213, DOI 10.17487/RFC8213, August 2017,
<https://www.rfc-editor.org/info/rfc8213>.
[RFC8415] Mrugalski, T., Siodelski, M., Volz, B., Yourtchenko, A.,
Richardson, M., Jiang, S., Lemon, T., Winters, T., and RFC
Publisher, "Dynamic Host Configuration Protocol for IPv6
(DHCPv6)", RFC 8415, DOI 10.17487/RFC8415, November 2018,
<https://www.rfc-editor.org/info/rfc8415>.
[RFC8987] Farrer, I., Kottapalli, N., Hunek, M., Patterson, R., and
RFC Publisher, "DHCPv6 Prefix Delegating Relay
Requirements", RFC 8987, DOI 10.17487/RFC8987, February
2021, <https://www.rfc-editor.org/info/rfc8987>.
Author's Address
Timothy Winters
QA Cafe
100 Main Street, Suite #212
Dover, NH 03820
United States of America
Email: tim@qacafe.com
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