draft-ietf-v6ops-64share-06.txt   draft-ietf-v6ops-64share-07.txt 
V6OPS Working Group C. Byrne V6OPS Working Group C. Byrne
Internet-Draft T-Mobile USA Internet-Draft T-Mobile USA
Intended Status: Informational D. Drown Intended Status: Informational D. Drown
Expires: November 18, 2013 A. Vizdal Expires: November 18, 2013 A. Vizdal
Deutsche Telekom AG Deutsche Telekom AG
May 17, 2013 May 17, 2013
Extending an IPv6 /64 Prefix from a 3GPP Mobile Interface to a LAN Extending an IPv6 /64 Prefix from a 3GPP Mobile Interface to a LAN
draft-ietf-v6ops-64share-06 draft-ietf-v6ops-64share-07
Abstract Abstract
This document describes three methods for extending an IPv6 /64 This document describes three methods for extending an IPv6 /64
prefix from a User Equipment 3GPP radio interface to a LAN. prefix from a User Equipment 3GPP radio interface to a LAN.
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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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
(http://trustee.ietf.org/license-info) in effect on the date of (http://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
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License. described in the Simplified BSD License.
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. The Challenge of Providing IPv6 Addresses to a LAN via a 3GPP 2. The Challenge of Providing IPv6 Addresses to a LAN via a 3GPP
UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Methods for Extending the 3GPP Interface /64 IPv6 Prefix to a 3. Methods for Extending the 3GPP Interface /64 IPv6 Prefix to a
LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.0 General Behavior for All Scenarios . . . . . . . . . . . . . 4 3.0 General Behavior for All Scenarios . . . . . . . . . . . . . 4
3.1 Scenario 1: No Global Address on the UE . . . . . . . . . . 4 3.1 Scenario 1: No Global Address on the UE . . . . . . . . . . 4
3.2 Scenario 2: Global Address Only Assigned to LAN . . . . . . 5 3.2 Scenario 2: Global Address Only Assigned to LAN . . . . . . 5
3.3 Scenario 3: A Single Global Address Assigned to 3GPP Radio 3.3 Scenario 3: A Single Global Address Assigned to 3GPP Radio
and LAN Interface . . . . . . . . . . . . . . . . . . . . . 6 and LAN Interface . . . . . . . . . . . . . . . . . . . . . 6
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 7 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 7
7. Informative References . . . . . . . . . . . . . . . . . . . . 7 7. Informative References . . . . . . . . . . . . . . . . . . . . 7
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
1. Introduction 1. Introduction
3GPP mobile cellular networks such as GSM, UMTS, and LTE have 3GPP mobile cellular networks such as GSM, UMTS, and LTE have
architectural support for IPv6 [RFC6459], but only 3GPP Release-10 architectural support for IPv6 [RFC6459], but only 3GPP Release-10
and onwards of the 3GPP specification supports DHCPv6 Prefix and onwards of the 3GPP specification supports DHCPv6 Prefix
Delegation [RFC3633] for delegating IPv6 prefixes to a LAN. To Delegation [RFC3633] for delegating IPv6 prefixes to a LAN. To
facilitate the use of IPv6 in a LAN prior to the deployment of DHCPv6 facilitate the use of IPv6 in a LAN prior to the deployment of DHCPv6
Prefix Delegation in 3GPP networks and in User Equipment (UE), this Prefix Delegation in 3GPP networks and in User Equipment (UE), this
document describes how the 3GPP UE radio interface assigned global document describes how the 3GPP UE radio interface assigned global
/64 prefix may be extended from the 3GPP radio interface to a LAN. /64 prefix may be extended from the 3GPP radio interface to a LAN.
This is achieved by receiving the Router Advertisement (RA) [RFC4861] This is achieved by receiving the Router Advertisement (RA) [RFC4861]
announced globally unique /64 IPv6 prefix from the 3GPP radio announced globally unique /64 IPv6 prefix from the 3GPP radio
interface and then advertising the same IPv6 prefix to the LAN with interface and then advertising the same IPv6 prefix to the LAN with
RA. For all of the cases in the scope of this document, the UE may RA. For all of the cases in the scope of this document, the UE may
be any device that function as an IPv6 router between the 3GPP be any device that functions as an IPv6 router between the 3GPP
network and a LAN. network and a LAN.
This document describes three methods for achieving IPv6 prefix This document describes three methods for achieving IPv6 prefix
extension from a 3GPP radio interface to a LAN including: extension from a 3GPP radio interface to a LAN including:
1) The 3GPP UE does not have a global scope IPv6 address on any 1) The 3GPP UE does not have a global scope IPv6 address on any
interface, only link-local IPv6 addresses are present on the UE interface, only link-local IPv6 addresses are present on the UE
2) The 3GPP UE only has a global scope address on the LAN interface 2) The 3GPP UE only has a global scope address on the LAN interface
3) The 3GPP UE maintains the same consistent 128 bit global scope 3) The 3GPP UE maintains the same consistent 128 bit global scope
IPv6 anycast address [RFC4291] on the 3GPP radio interface and the IPv6 anycast address [RFC4291] on the 3GPP radio interface and the
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Neighbor Discovery Proxy (ND Proxy) [RFC4389] functionality has been Neighbor Discovery Proxy (ND Proxy) [RFC4389] functionality has been
suggested as an option for extending the assigned /64 from the 3GPP suggested as an option for extending the assigned /64 from the 3GPP
radio interface to the LAN, but ND Proxy is an experimental protocol radio interface to the LAN, but ND Proxy is an experimental protocol
and has some limitations with loop-avoidance. and has some limitations with loop-avoidance.
DHCPv6 is the best way to delegate a prefix to a LAN. The methods DHCPv6 is the best way to delegate a prefix to a LAN. The methods
described in this document should only be applied when deploying described in this document should only be applied when deploying
DHCPv6 Prefix Delegation is not achievable in the 3GPP network and DHCPv6 Prefix Delegation is not achievable in the 3GPP network and
the UE. The methods described in this document are at various stages the UE. The methods described in this document are at various stages
of implementation and deployment planning. The goal of this memo is of implementation and deployment planning. The goal of this memo is
to document the available methods which may used prior to DHCPv6 to document the available methods which may be used prior to DHCPv6
deployment. deployment.
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
3. Methods for Extending the 3GPP Interface /64 IPv6 Prefix to a LAN 3. Methods for Extending the 3GPP Interface /64 IPv6 Prefix to a LAN
3.0 General Behavior for All Scenarios 3.0 General Behavior for All Scenarios
As [RFC6459] describes, the 3GPP network assigned /64 is completely As [RFC6459] describes, the 3GPP network assigned /64 is completely
dedicated to the UE and the gateway does not consume any of the /64 dedicated to the UE and the gateway does not consume any of the /64
addresses. The gateway routes the entire /64 to the UE and does not addresses. The gateway routes the entire /64 to the UE and does not
perform ND or Network Unreachability Detection (NUD) [RFC4861]. perform ND or Network Unreachability Detection (NUD) [RFC4861].
Communication between the UE and the gateway is only done using link- Communication between the UE and the gateway is only done using link-
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Below is the general procedure for this scenario: Below is the general procedure for this scenario:
1. The user activates router functionality for a LAN on the UE. 1. The user activates router functionality for a LAN on the UE.
2. The UE checks to make sure the 3GPP interface is active and has 2. The UE checks to make sure the 3GPP interface is active and has
an IPv6 address. If the interface does not have an IPv6 address, an IPv6 address. If the interface does not have an IPv6 address,
an attempt will be made to acquire one, or else the procedure an attempt will be made to acquire one, or else the procedure
will terminate. will terminate.
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
3. In this example, the UE finds the 3GPP interface has the IPv6 3. In this example, the UE finds the 3GPP interface has the IPv6
address 2001:db8:ac10:f002:1234:4567:0:9/64 assigned and active. address 2001:db8:ac10:f002:1234:4567:0:9/64 assigned and active.
4. The UE copies the prefix 2001:db8:ac10:f002::/64 from the 3GPP 4. The UE copies the prefix 2001:db8:ac10:f002::/64 from the 3GPP
interface to the LAN interface, removes the global IPv6 address interface to the LAN interface, removes the global IPv6 address
configuration from the 3GPP radio interface, disables the IPv6 configuration from the 3GPP radio interface, disables the IPv6
Stateless Address Autoconfiguration (SLAAC) [RFC4862] feature for Stateless Address Autoconfiguration (SLAAC) [RFC4862] feature for
global addresses on the 3GPP radio interface to avoid address global addresses on the 3GPP radio interface to avoid address
autoconfiguration, and begins announcing the global prefix autoconfiguration, and begins announcing the global prefix
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Below is the general procedure for this scenario: Below is the general procedure for this scenario:
1. The user activates router functionality for a LAN on the UE. 1. The user activates router functionality for a LAN on the UE.
2. The UE checks to make sure the 3GPP interface is active and has 2. The UE checks to make sure the 3GPP interface is active and has
an IPv6 address. If the interface does not have an IPv6 address, an IPv6 address. If the interface does not have an IPv6 address,
an attempt will be made to acquire one, or else the procedure an attempt will be made to acquire one, or else the procedure
will terminate. will terminate.
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
3. In this example, the UE finds the 3GPP interface has the IPv6 3. In this example, the UE finds the 3GPP interface has the IPv6
address 2001:db8:ac10:f002:1234:4567:0:9 assigned and active. address 2001:db8:ac10:f002:1234:4567:0:9 assigned and active.
4. The UE moves the address 2001:db8:ac10:f002:1234:4567:0:9 as a 4. The UE moves the address 2001:db8:ac10:f002:1234:4567:0:9 as a
/64 from the 3GPP interfaces to the LAN interface, disables the /64 from the 3GPP interfaces to the LAN interface, disables the
IPv6 SLAAC feature on the 3GPP radio interface to avoid address IPv6 SLAAC feature on the 3GPP radio interface to avoid address
autoconfiguration, and begins announcing the prefix autoconfiguration, and begins announcing the prefix
2001:db8:ac10:f002::/64 via RA to the LAN. For this example, the 2001:db8:ac10:f002::/64 via RA to the LAN. For this example, the
LAN has 2001:db8:ac10:f002:1234:4567:0:9/64 and the 3GPP radio LAN has 2001:db8:ac10:f002:1234:4567:0:9/64 and the 3GPP radio
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Extensions should be disabled on the 3GPP radio interface while this Extensions should be disabled on the 3GPP radio interface while this
method is enabled. method is enabled.
There might also be more complex scenarios in which the prefix length There might also be more complex scenarios in which the prefix length
is not changed and privacy extensions are supported by having the is not changed and privacy extensions are supported by having the
subnet span multiple interfaces, as ND Proxy does [RFC4389]. Further subnet span multiple interfaces, as ND Proxy does [RFC4389]. Further
elaboration is out of scope of the present document. elaboration is out of scope of the present document.
Below is the general procedure for this scenario: Below is the general procedure for this scenario:
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
1. The user activates router functionality for a LAN on the UE. 1. The user activates router functionality for a LAN on the UE.
2. The UE checks to make sure the 3GPP interfaces is active and has 2. The UE checks to make sure the 3GPP interfaces is active and has
an IPv6 address. If the interface does not have an IPv6 address, an IPv6 address. If the interface does not have an IPv6 address,
an attempt will be made to acquire one, or else the procedure an attempt will be made to acquire one, or else the procedure
will terminate. will terminate.
3. In this example, the UE finds the 3GPP interface has the IPv6 3. In this example, the UE finds the 3GPP interface has the IPv6
address 2001:db8:ac10:f002:1234:4567:0:9 assigned and active. address 2001:db8:ac10:f002:1234:4567:0:9 assigned and active.
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Many thanks for review and discussion from Dave Thaler, Sylvain Many thanks for review and discussion from Dave Thaler, Sylvain
Decremps, Mark Smith, Dmitry Anipko, Masanobu Kawashima, Teemu Decremps, Mark Smith, Dmitry Anipko, Masanobu Kawashima, Teemu
Savolainen, Mikael Abrahamsson, Eric Vyncke, Alexandru Petrescu, Savolainen, Mikael Abrahamsson, Eric Vyncke, Alexandru Petrescu,
Jouni Korhonen, and Julien Laganier. Jouni Korhonen, and Julien Laganier.
7. Informative References 7. Informative References
[RFC1981] McCann, J., Deering, S., and J. Mogul, "Path MTU Discovery [RFC1981] McCann, J., Deering, S., and J. Mogul, "Path MTU Discovery
V6OPS Working Group draft-ietf-v6ops-64share-06 May 17, 2013 V6OPS Working Group draft-ietf-v6ops-64share-07 May 17, 2013
for IP version 6", RFC 1981, August 1996. for IP version 6", RFC 1981, August 1996.
[RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic [RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic
Host Configuration Protocol (DHCP) version 6", RFC 3633, Host Configuration Protocol (DHCP) version 6", RFC 3633,
December 2003. December 2003.
[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing [RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing
Architecture", RFC 4291, February 2006. Architecture", RFC 4291, February 2006.
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