draft-ietf-v6ops-64share-09.txt   draft-ietf-v6ops-64share-10.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: April 9, 2014 A. Vizdal Expires: October 4, 2014 A. Vizdal
Deutsche Telekom AG Deutsche Telekom AG
October 6, 2013 April 2, 2014
Extending an IPv6 /64 Prefix from a 3GPP Mobile Interface to a LAN link Extending an IPv6 /64 Prefix from a 3GPP Mobile Interface to a LAN link
draft-ietf-v6ops-64share-09 draft-ietf-v6ops-64share-10
Abstract Abstract
This document describes requirements for extending an IPv6 /64 prefix This document describes requirements for extending an IPv6 /64 prefix
from a User Equipment 3GPP radio interface to a LAN link as well as from a User Equipment 3GPP radio interface to a LAN link as well as
two implementation examples. two implementation examples.
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
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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 April 6, 2014. This Internet-Draft will expire on April 6, 2014.
Copyright and License Notice Copyright and License Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2014 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
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publication of this document. Please review these documents publication of this document. Please review these documents
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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.
Table of Contents Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Special Language . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Special Language . . . . . . . . . . . . . . . . . . . . . . 3
2. The Challenge of Providing IPv6 Addresses to a LAN link via a 2. The Challenge of Providing IPv6 Addresses to a LAN link via a
3GPP UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3GPP UE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Requirements for Extending the 3GPP Interface /64 IPv6 Prefix 3. Requirements for Extending the 3GPP Interface /64 IPv6 Prefix
to a LAN link . . . . . . . . . . . . . . . . . . . . . . . . . 4 to a LAN link . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Example Methods for Extending the 3GPP Interface /64 IPv6 4. Example Methods for Extending the 3GPP Interface /64 IPv6
Prefix to a LAN link . . . . . . . . . . . . . . . . . . . . . 4 Prefix to a LAN link . . . . . . . . . . . . . . . . . . . . . 5
4.1 General Behavior for All Example Scenarios . . . . . . . . . 4 4.1 General Behavior for All Example Scenarios . . . . . . . . . 5
4.2 Example Scenario 1: Global Address Only Assigned to LAN 4.2 Example Scenario 1: Global Address Only Assigned to LAN
link . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 link . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.3 Example Scenario 2: A Single Global Address Assigned to 4.3 Example Scenario 2: A Single Global Address Assigned to
3GPP Radio and LAN link . . . . . . . . . . . . . . . . . . 6 3GPP Radio and LAN link . . . . . . . . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 7 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 7 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 8
8. Informative References . . . . . . . . . . . . . . . . . . . . 7 8. Informative References . . . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 9
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 [TS.23401] supports DHCPv6
Delegation [RFC3633] for delegating IPv6 prefixes to a single LAN Prefix Delegation [RFC3633] for delegating IPv6 prefixes to a single
link. To facilitate the use of IPv6 in a LAN prior to the deployment LAN link.
of DHCPv6 Prefix Delegation in 3GPP networks and in User Equipment
(UE), this document describes requirements and provides examples on To facilitate the use of IPv6 in a LAN prior to the deployment of
how the 3GPP UE radio interface assigned global /64 prefix may be DHCPv6 Prefix Delegation in 3GPP networks and in User Equipment (UE),
extended from the 3GPP radio interface to a LAN link. this document describes requirements and provides examples on how the
3GPP UE radio interface assigned global /64 prefix may be extended
from the 3GPP radio interface to a LAN link.
There are two scenarios where this might be done. The first is where
the 3GPP node sets up and manages its own LAN (e.g., an IEEE 802.11
SSID) and provides single-homed service to hosts that connect to this
LAN. A second scenario is where the 3GPP node connects to an
existing LAN and acts as a router in order to provide redundant or
multi-homed IPv6 service.
This document is intended to address the first scenario, and is not
applicable to the second scenario, because the operational
complexities of the second scenario are not addressed.
This can be achieved by receiving the Router Advertisement (RA) This can be achieved by receiving the Router Advertisement (RA)
[RFC4861] announced globally unique /64 IPv6 prefix from the 3GPP [RFC4861] announced globally unique /64 IPv6 prefix from the 3GPP
radio interface and then advertising the same IPv6 prefix to the LAN radio interface by the UE and then advertising the same IPv6 prefix
link with RA. For all of the cases in the scope of this document, to the LAN link with RA. For all of the cases in the scope of this
the UE may be any device that functions as an IPv6 router between the document, the UE may be any device that functions as an IPv6 router
3GPP network and a LAN. between the 3GPP network and a LAN.
This document describes requirements for achieving IPv6 prefix This document describes requirements for achieving IPv6 prefix
extension from a 3GPP radio interface to a LAN link including two extension from a 3GPP radio interface to a LAN link including two
practical implementation examples: practical implementation examples:
1) The 3GPP UE only has a global scope address on the LAN link 1) The 3GPP UE only has a global scope address on the LAN link
2) The 3GPP UE maintains the same consistent 128 bit global scope 2) 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
LAN link. The LAN link is configured as a /64 and the 3GPP radio LAN link. The LAN link is configured as a /64 and the 3GPP radio
interface is configured as a /128. interface is configured as a /128.
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As described in [RFC6459], 3GPP networks assign a /64 global scope As described in [RFC6459], 3GPP networks assign a /64 global scope
prefix to each UE using RA. DHCPv6 Prefix Delegation is an optional prefix to each UE using RA. DHCPv6 Prefix Delegation is an optional
part of 3GPP Release-10 and is not covered by any earlier releases. part of 3GPP Release-10 and is not covered by any earlier releases.
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 link, but ND Proxy is an experimental radio interface to the LAN link, but ND Proxy is an experimental
protocol and has some limitations with loop-avoidance. protocol and has some limitations with loop-avoidance.
DHCPv6 is the best way to delegate a prefix to a LAN link. The DHCPv6 is the best way to delegate a prefix to a LAN link. The
methods described in this document should only be applied when methods described in this document SHOULD only be applied when
deploying DHCPv6 Prefix Delegation is not achievable in the 3GPP deploying DHCPv6 Prefix Delegation is not achievable in the 3GPP
network and the UE. The methods described in this document are at network and the UE. The methods described in this document are at
various stages of implementation and deployment planning. The goal various stages of implementation and deployment planning. The goal
of this memo is to document the available methods which may be used of this memo is to document the available methods which may be used
prior to DHCPv6 deployment. prior to DHCPv6 deployment.
3. Requirements for Extending the 3GPP Interface /64 IPv6 Prefix to a 3. Requirements for Extending the 3GPP Interface /64 IPv6 Prefix to a
LAN link LAN link
R-1: The 3GPP network provided /64 prefix MUST be made available on R-1: The 3GPP network provided /64 prefix MUST be made available on
the LAN link. the LAN link.
LAN attached devices shall be able to use the 3GPP network LAN attached devices shall be able to use the 3GPP network
assigned IPv6 prefix (e.g. using SLAAC [RFC4862]). assigned IPv6 prefix (e.g. using IPv6 Stateless Address
Autoconfiguration - SLAAC [RFC4862]).
R-2: The UE MUST defend all its IPv6 addresses on the LAN link. R-2: The UE MUST defend all its IPv6 addresses on the LAN link.
In case a LAN attached node will e.g. autoconfigure the same In case a LAN attached node will e.g. autoconfigure the same
global IPv6 address as used on the 3GPP interface, the UE must global IPv6 address as used on the 3GPP interface, the UE must
fail the Duplicate Address Detection process run by the LAN node. fail the Duplicate Address Detection (DAD) [RFC4862] process run
by the LAN node.
R-3: The LAN link configuration MUST be tightly coupled with the 3GPP R-3: The LAN link configuration MUST be tightly coupled with the 3GPP
link state. link state.
R-4: The UE MUST decrement the TTL when passing packets between IPv6 R-4: The UE MUST decrement the TTL when passing packets between IPv6
links across the UE. links across the UE.
4. Example Methods for Extending the 3GPP Interface /64 IPv6 Prefix to a 4. Example Methods for Extending the 3GPP Interface /64 IPv6 Prefix to a
LAN link LAN link
4.1 General Behavior for All Example Scenarios 4.1 General Behavior for All Example 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-
local addresses and the link is point-to-point. This allows for the local addresses and the link is point-to-point. This allows for the
UE to reliably manipulate the /64 from the 3GPP radio interface UE to reliably manipulate the /64 from the 3GPP radio interface
without negatively impacting the point-to-point 3GPP radio link without negatively impacting the point-to-point 3GPP radio link
interface. The LAN link RA configuration must be tightly coupled interface. The LAN link Router Advertisement (RA) configuration must
with the 3GPP link state. If the 3GPP link goes down or changes the be tightly coupled with the 3GPP link state. If the 3GPP link goes
IPv6 prefix, that state should be reflected in the LAN link IPv6 down or changes the IPv6 prefix, that state should be reflected in
configuration. Just as in a standard IPv6 router, the packet TTL the LAN link IPv6 configuration. Just as in a standard IPv6 router,
will be decremented when passing packets between IPv6 links across the packet TTL will be decremented when passing packets between IPv6
the UE. The UE is employing the weak host model [RFC1122]. The RA links across the UE. The UE is employing the weak host model
function on the UE is exclusively run on the LAN link. [RFC1122]. The RA function on the UE is exclusively run on the LAN
link.
The LAN link originated RA message carries a copy of the following The LAN link originated RA message carries a copy of the following
3GPP radio link received RA message option fields: 3GPP radio link received RA message option fields:
o MTU (if not provided by the 3GPP network, the UE will provide its o MTU (if not provided by the 3GPP network, the UE will provide its
3GPP link MTU size) 3GPP link MTU size)
o Prefix Information o Prefix Information
4.2 Example Scenario 1: Global Address Only Assigned to LAN link 4.2 Example Scenario 1: Global Address Only Assigned to LAN link
For this case, the UE receives the RA from the 3GPP network but does For this case, the UE receives the RA from the 3GPP network but does
not use a global address on the 3GPP interface. The 3GPP RA /64 not use a global address on the 3GPP interface. The 3GPP interface
prefix information is used to configure NDP on the LAN and assigns received RA /64 prefix information is used to configure NDP on the
itself an address on the LAN link. The LAN link uses RA to announce LAN. The UE assigns itself an IPv6 address on the LAN link from the
the prefix to the LAN. The UE LAN link interface defends its LAN 3GPP interface received RA. The LAN link uses RA to announce the
IPv6 address with DAD. The UE shall not run Stateless Address prefix to the LAN. The UE LAN link interface defends its LAN IPv6
Autoconfiguration [RFC4862] to assign a global address on the 3GPP address with DAD. The UE shall not run SLAAC to assign a global
radio interface while routing is enabled. address on the 3GPP radio interface while routing is enabled.
This method allows the UE to originate and terminate IPv6 This method allows the UE to originate and terminate IPv6
communications as a host while acting as an IPv6 router. The communications as a host while acting as an IPv6 router. The
movement of the IPv6 prefix from the 3GPP radio interface to the LAN movement of the IPv6 prefix from the 3GPP radio interface to the LAN
link may result in long-lived data connections being terminated link may result in long-lived data connections being terminated
during the transition from a host-only mode to router-and-host mode. during the transition from a host-only mode to router-and-host mode.
Connections which are likely to be affected are ones that have been Connections which are likely to be affected are ones that have been
specifically bound to the 3GPP radio interface. This method is specifically bound to the 3GPP radio interface. This method is
appropriate if the UE or software on the UE cannot support multiple appropriate if the UE or software on the UE cannot support multiple
interfaces with the same anycast IPv6 address and the UE requires interfaces with the same anycast IPv6 address and the UE requires
global connectivity while acting as a router. global connectivity while acting as a router.
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.
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4.3 Example Scenario 2: A Single Global Address Assigned to 3GPP Radio 4.3 Example Scenario 2: A Single Global Address Assigned to 3GPP Radio
and LAN link and LAN link
In this method, the UE assigns itself one address from the 3GPP In this method, the UE assigns itself one address from the 3GPP
network RA announced /64. This one address is configured as anycast network RA announced /64. This one address is configured as anycast
[RFC4291] on both the 3GPP radio link as a /128 and on the LAN link [RFC4291] on both the 3GPP radio link as a /128 and on the LAN link
as a /64. This allows the UE to maintain long lived data connections as a /64. This allows the UE to maintain long lived data connections
since the 3GPP radio interface address does not change when the since the 3GPP radio interface address does not change when the
router function is activated. This method may cause complications router function is activated. This method may cause complications
for certain software that may not support multiple interfaces with for certain software that may not support multiple interfaces with
the same anycast IPv6 address or are sensitive to prefix length the same anycast IPv6 address, or are sensitive to prefix length
changes. This method also creates complications for ensuring changes. This method also creates complications for ensuring
uniqueness for Privacy Extensions [RFC4941]. When Privacy Extensions uniqueness for Privacy Extensions [RFC4941]. When Privacy Extensions
are in use all temporary addresses will be copied from the 3GPP radio are in use all temporary addresses will be copied from the 3GPP radio
interface to the LAN link and the preferred and valid lifetimes will interface to the LAN link. The preferred and valid lifetimes will be
be synchronized, such that the temporary anycast addresses on both synchronized, such that the temporary anycast addresses on both
interfaces expire simultaneously. interfaces expire simultaneously.
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:
1. The user activates router functionality for a LAN on the UE. 1. The user activates router functionality for a LAN on the UE.
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2001:db8:ac10:f002:1234:4567:0:9. 2001:db8:ac10:f002:1234:4567:0:9.
6. On the LAN interface, there is no chance of address conflict 6. On the LAN interface, there is no chance of address conflict
since the address is defended using DAD. The 3GPP radio since the address is defended using DAD. The 3GPP radio
interface only has a /128 and no other systems on the 3GPP radio interface only has a /128 and no other systems on the 3GPP radio
point-to-point link may use the global /64. point-to-point link may use the global /64.
5. Security Considerations 5. Security Considerations
Since the UE will be switched from an IPv6 host mode to an IPv6 Since the UE will be switched from an IPv6 host mode to an IPv6
router-and-host mode a basic IPv6 CPE security functions [RFC6092] router-and-host mode, a basic IPv6 CPE security functions [RFC6092]
shall be considered. SHOULD be applied.
Despite the use of temporary IPv6 addresses, the mobile network
provided /64 prefix is common to all the LAN attached devices
potentially concerning privacy. A nomadic device (e.g. a smartphone)
provided IPv6 prefix is not a long lived one due to re-attaches
caused by a device reload, traveling through loosely covered areas,
etc. The network will provide a new IPv6 prefix after a successful
re-attach.
3GPP mobile network capable CPEs (e.g. a router) are likely to keep
the mobile network data connection up for a longer time. Some mobile
networks may be re-setting the mobile network connection regularly
(e.g. every 24 hours) others may not. Privacy concerned users shall
take appropriate measures to not to keep their IPv6 prefixes long-
lived.
6. IANA Considerations 6. IANA Considerations
This document does not require any action from IANA. This document does not require any action from IANA.
7. Acknowledgments 7. Acknowledgments
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, Lorenzo Colitti, Julien Laganier, Owen DeLong and Jouni Korhonen, Lorenzo Colitti, Julien Laganier, Owen DeLong, Holger
Holger Metschulat. Metschulat, Yaron Sheffer and Victor Kuarsingh. Special thanks to Ann
Cerveny for her language review.
8. Informative References 8. Informative References
[RFC1122] Braden, R., Ed., "Requirements for Internet Hosts - [RFC1122] Braden, R., Ed., "Requirements for Internet Hosts -
Communication Layers", STD 3, RFC 1122, October 1989. Communication Layers", STD 3, RFC 1122, October 1989.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997. Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic [RFC3633] Troan, O. and R. Droms, "IPv6 Prefix Options for Dynamic
skipping to change at page 8, line 37 skipping to change at page 9, line 22
[RFC6092] Woodyatt, J., Ed., "Recommended Simple Security [RFC6092] Woodyatt, J., Ed., "Recommended Simple Security
Capabilities in Customer Premises Equipment (CPE) for Capabilities in Customer Premises Equipment (CPE) for
Providing Residential IPv6 Internet Service", RFC 6092, Providing Residential IPv6 Internet Service", RFC 6092,
January 2011. January 2011.
[RFC6459] Korhonen, J., Ed., Soininen, J., Patil, B., Savolainen, [RFC6459] Korhonen, J., Ed., Soininen, J., Patil, B., Savolainen,
T., Bajko, G., and K. Iisakkila, "IPv6 in 3rd Generation T., Bajko, G., and K. Iisakkila, "IPv6 in 3rd Generation
Partnership Project (3GPP) Evolved Packet System (EPS)", Partnership Project (3GPP) Evolved Packet System (EPS)",
RFC 6459, January 2012. RFC 6459, January 2012.
[TS.23401] 3GPP, "General Packet Radio Service (GPRS) enhancements
for Evolved Universal Terrestrial Radio Access Network (E-
UTRAN) access", 3GPP TS 23.401 10.0.0, June 2010.
Authors' Addresses Authors' Addresses
Cameron Byrne Cameron Byrne
T-Mobile USA T-Mobile USA
Bellevue, Washington, USA Bellevue, Washington, USA
EMail: Cameron.Byrne@T-Mobile.com EMail: Cameron.Byrne@T-Mobile.com
Dan Drown Dan Drown
Email: Dan@Drown.org EMail: Dan@Drown.org
Ales Vizdal Ales Vizdal
Deutsche Telekom AG Deutsche Telekom AG
Tomickova 2144/1 Tomickova 2144/1
Prague, 149 00 Prague, 149 00
Czech Republic Czech Republic
EMail: Ales.Vizdal@T-Mobile.cz EMail: Ales.Vizdal@T-Mobile.cz
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