Internet DRAFT - draft-ietf-hip-rfc5203-bis
draft-ietf-hip-rfc5203-bis
Network Working Group J. Laganier
Internet-Draft Luminate Wireless, Inc.
Obsoletes: 5203 (if approved) L. Eggert
Intended status: Standards Track NetApp
Expires: August 3, 2016 January 31, 2016
Host Identity Protocol (HIP) Registration Extension
draft-ietf-hip-rfc5203-bis-10
Abstract
This document specifies a registration mechanism for the Host
Identity Protocol (HIP) that allows hosts to register with services,
such as HIP rendezvous servers or middleboxes. This document
obsoletes RFC5203.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on August 3, 2016.
Copyright Notice
Copyright (c) 2016 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
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described in the Simplified BSD License.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. HIP Registration Extension Overview . . . . . . . . . . . . . 3
3.1. Registrar Announcing Its Ability . . . . . . . . . . . . 4
3.2. Requester Requesting Registration . . . . . . . . . . . . 4
3.3. Registrar Granting or Refusing Service(s) Registration . 4
4. Parameter Formats and Processing . . . . . . . . . . . . . . 6
4.1. Encoding Registration Lifetimes with Exponents . . . . . 6
4.2. REG_INFO . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3. REG_REQUEST . . . . . . . . . . . . . . . . . . . . . . . 7
4.4. REG_RESPONSE . . . . . . . . . . . . . . . . . . . . . . 8
4.5. REG_FAILED . . . . . . . . . . . . . . . . . . . . . . . 9
5. Establishing and Maintaining Registrations . . . . . . . . . 11
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 12
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 12
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
10.1. Normative References . . . . . . . . . . . . . . . . . . 13
10.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. Changes from RFC 5203 . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
This document specifies an extension to the Host Identity Protocol
(HIP) [RFC7401]. The extension provides a generic means for a host
to register with a service. The service may, for example, be a HIP
rendezvous server [I-D.ietf-hip-rfc5204-bis] or a middlebox
[RFC3234].
This document makes no further assumptions about the exact type of
service. Likewise, this document does not specify any mechanisms to
discover the presence of specific services or means to interact with
them after registration. Future documents may describe those
operations.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
2. Terminology
In addition to the terminology defined in the HIP Architecture
[I-D.ietf-hip-rfc4423-bis], the HIP specification [RFC7401], and the
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HIP Rendezvous Extension [I-D.ietf-hip-rfc5204-bis], this document
defines and uses the following terms:
Requester:
a HIP node registering with a HIP registrar to request
registration for a service.
Registrar:
a HIP node offering registration for one or more services.
Service:
a facility that provides requesters with new capabilities or
functionalities operating at the HIP layer. Examples include
firewalls that support HIP traversal or HIP rendezvous servers.
Registration:
shared state stored by a requester and a registrar, allowing the
requester to benefit from one or more HIP services offered by the
registrar. Each registration has an associated finite lifetime.
Requesters can extend established registrations through re-
registration (i.e., perform a refresh).
Registration Type:
an identifier for a given service in the registration protocol.
For example, the rendezvous service is identified by a specific
registration type.
3. HIP Registration Extension Overview
This document does not specify the means by which a requester
discovers the availability of a service, or how a requester locates a
registrar. After a requester has discovered a registrar, it either
initiates HIP base exchange or uses an existing HIP association with
the registrar. In both cases, registrars use additional parameters,
which the remainder of this document defines, to announce their
quality and grant or refuse registration. Requesters use
corresponding parameters to register with the service. Both the
registrar and the requester MAY also include in the messages
exchanged additional HIP parameters specific to the registration type
requested. Other documents will define parameters and how they shall
be used.
The HIP base exchange, including the definition of the HIP I1, R1,
I2, and R2 packets, is defined in RFC7401 [RFC7401]. The following
sections describe the differences between this registration handshake
and the standard HIP base exchange [RFC7401].
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3.1. Registrar Announcing Its Ability
A host that is capable and willing to act as a registrar vis-a-vis a
specific requester SHOULD include a REG_INFO parameter in the R1
packets it sends during all base exchanges with that requester. If
it is currently unable to provide services due to transient
conditions, it SHOULD include an empty REG_INFO, i.e., one with no
services listed. If services can be provided later, it SHOULD send
UPDATE packets indicating the current set of services available in a
new REG_INFO parameter to all hosts it is associated with.
3.2. Requester Requesting Registration
To request registration with a service, a requester constructs and
includes a corresponding REG_REQUEST parameter in an I2 or UPDATE
packet it sends to the registrar.
If the requester has no HIP association established with the
registrar, it SHOULD send the REG_REQUEST at the earliest
possibility, i.e., in the I2 packet. This minimizes the number of
packets that need to be exchanged with the registrar. A registrar
MAY end a HIP association that does not carry a REG_REQUEST by
including a NOTIFY with the type REG_REQUIRED in the R2. In this
case, no HIP association is created between the hosts. The
REG_REQUIRED notification error type is 51.
3.3. Registrar Granting or Refusing Service(s) Registration
Once registration has been requested, the registrar is able to
authenticate the requester based on the host identity included in I2.
If the registrar knows the Host Identities (HIs) of all the hosts
that are allowed to register for service(s), it SHOULD reject
registrations from unknown hosts. However, since it may be
infeasible to pre-configure the registrar with all the HIs, the
registrar SHOULD also support HIP certificates
[I-D.ietf-hip-rfc6253-bis] to allow for certificate based
authentication.
When a requester wants to register with a registrar, it SHOULD check
if it has a suitable certificate for authenticating with the
registrar. How the suitability is determined and how the
certificates are obtained is out of scope for this document. If the
requester has one or more suitable certificates, the host SHOULD
include them (or just the most suitable one) in a CERT parameter to
the HIP packet along with the REG_REQUEST parameter. If the
requester does not have any suitable certificates, it SHOULD send the
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registration request without the CERT parameter to test whether the
registrar accepts the request based on the host's identity.
When a registrar receives a HIP packet with a REG_REQUEST parameter,
and it requires authentication for at least one of the Registration
Types listed in the REG_REQUEST parameter, it MUST first check
whether the HI of the requester is in the allowed list for all the
Registration Types in the REG_REQUEST parameter. If the requester is
in the allowed list (or the registrar does not require any
authentication), the registrar MUST proceed with the registration.
If the requester was not in the allowed list and the registrar
requires the requester to authenticate, the registrar MUST check
whether the packet also contains a CERT parameter. If the packet
does not contain a CERT parameter, the registrar MUST reject the
registrations requiring authentication with Failure Type 0
(Registration requires additional credentials). If the certificate
is valid and accepted (issued for the requester and signed by a
trusted issuer), the registrar MUST proceed with the registration.
If the certificate in the parameter is not accepted, the registrar
MUST reject the corresponding registrations with Failure Type [IANA
TBD] (Invalid certificate).
After successful authorization, the registrar includes a REG_RESPONSE
parameter in its response, which contains the service type(s) for
which it has authorized registration, and zero or more REG_FAILED
parameters containing the service type(s) for which it has not
authorized registration or registration has failed for other reasons.
This response can be either an R2 or an UPDATE message, respectively,
depending on whether the registration was requested during the base
exchange, or using an existing association. In particular,
REG_FAILED with a failure type of zero indicates the service(s)
type(s) that require further credentials for registration.
If the registrar requires further authorization and the requester has
additional credentials available, the requester SHOULD try to
register again with the service after the HIP association has been
established.
Successful processing of a REG_RESPONSE parameter creates
registration state at the requester. In a similar manner, successful
processing of a REG_REQUEST parameter creates registration state at
the registrar and possibly at the service. Both the requester and
registrar can cancel a registration before it expires, if the
services afforded by a registration are no longer needed by the
requester, or cannot be provided any longer by the registrar (for
instance, because its configuration has changed).
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+-----+ I1 +-----+-----+
| |--------------------->| | S1 |
| |<---------------------| | |
| | R1(REG_INFO:S1,S2,S3)| +-----+
| RQ | | R | S2 |
| | I2(REG_REQ:S1) | | |
| |--------------------->| +-----+
| |<---------------------| | S3 |
| | R2(REG_RESP:S1) | | |
+-----+ +-----+-----+
A requester (RQ) registers for service (S1) with a registrar (R) of
services (S1), (S2), and (S3), with which it has no current HIP
association.
+-----+ +-----+-----+
| | UPDATE(REG_INFO:S) | | |
| |<---------------------| | |
| RQ |--------------------->| R | S |
| | UPDATE(REG_REQ:S) | | |
| | UPDATE(REG_RESP:S) | | |
| |<---------------------| | |
+-----+ +-----+-----+
A requester (RQ) registers for service (S) with a registrar (R) of
services (S), with which it currently has a HIP association
established.
4. Parameter Formats and Processing
This section describes the format and processing of the new
parameters introduced by the HIP registration extension. The
encoding of these new parameters is conforms to the HIPv2 TLV format
described in section 5.2.1 of RFC7401 [RFC7401].
4.1. Encoding Registration Lifetimes with Exponents
The HIP registration uses an exponential encoding of registration
lifetimes.
The special value 0 (zero) of the lifetime field MUST be interpreted
as representing a special lifetime duration of 0 (zero) seconds, and
is used to request and grant cancellation of a registration.
The non-zero values of the lifetime field used throughout this
document MUST be interpreted as an exponent value representing a
lifetime duration of 2^((lifetime - 64)/8) seconds.
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This allows a compact encoding of 255 different lifetime durations
(in addition to the special lifetime duration of zero seconds)
ranging from 2^(63/8) seconds (i.e., ~4 ms) to 2^(191/8) seconds
(i.e., ~178 days) into an 8-bit integer field.
4.2. REG_INFO
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Min Lifetime | Max Lifetime | Reg Type #1 | Reg Type #2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | ... | Reg Type #n | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Padding +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type 930
Length Length in octets, excluding Type, Length, and Padding.
Min Lifetime Minimum registration lifetime.
Max Lifetime Maximum registration lifetime.
Reg Type The registration types offered by the registrar.
Other documents will define specific values for registration types.
See Section 7 for more information.
Registrars include the parameter in R1 packets in order to announce
their registration capabilities. The registrar SHOULD include the
parameter in UPDATE packets when its service offering has changed.
HIP_SIGNATURE_2 protects the parameter within the R1 packets.
The registrar indicates the minimum and maximum registration lifetime
that it is willing to offer to a requester. A requester SHOULD NOT
request registration with lifetime greater than the maximum
registration lifetime or smaller than the minimum registration
lifetime.
4.3. REG_REQUEST
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Lifetime | Reg Type #1 | Reg Type #2 | Reg Type #3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | ... | Reg Type #n | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Padding +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type 932
Length Length in octets, excluding Type, Length, and Padding.
Lifetime Requested registration lifetime.
Reg Type The preferred registration types in order of preference.
Other documents will define specific values for registration types.
See Section 7 for more information.
A requester includes the REG_REQUEST parameter in I2 or UPDATE
packets to register with a registrar's service(s). If the
REG_REQUEST parameter is in an UPDATE packet, the registrar MUST NOT
modify the registrations of registration types that are not listed in
the parameter. Moreover, the requester MUST NOT include the
parameter unless the registrar's R1 packet or latest received UPDATE
packet has contained a REG_INFO parameter with the requested
registration types.
The requester MUST NOT include more than one REG_REQUEST parameter in
its I2 or UPDATE packets, while the registrar MUST be able to process
one or more REG_REQUEST parameters in received I2 or UPDATE packets.
When the registrar receives a registration with a lifetime that is
either smaller or greater than the minimum or maximum lifetime,
respectively, then it SHOULD grant the registration for the minimum
or maximum lifetime, respectively.
HIP_SIGNATURE protects the parameter within the I2 and UPDATE
packets.
4.4. REG_RESPONSE
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Lifetime | Reg Type #1 | Reg Type #2 | Reg Type #3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | ... | Reg Type #n | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Padding +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type 934
Length Length in octets, excluding Type, Length, and Padding.
Lifetime Granted registration lifetime.
Reg Type The granted registration types in order of preference.
Other documents will define specific values for registration types.
See Section 7 for more information.
The registrar SHOULD includes an REG_RESPONSE parameter in its R2 or
UPDATE packet only if a registration has successfully completed.
The registrar MUST NOT include more than one REG_RESPONSE parameter
in its R2 or UPDATE packets, while the requester MUST be able to
process one or more REG_RESPONSE parameters in received R2 or UPDATE
packets.
The requester MUST be prepared to receive any registration lifetime,
including ones beyond the minimum and maximum lifetime indicated in
the REG_INFO parameter. It MUST NOT expect that the returned
lifetime will be the requested one, even when the requested lifetime
falls within the announced minimum and maximum.
HIP_SIGNATURE protects the parameter within the R2 and UPDATE
packets.
4.5. REG_FAILED
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Failure Type | Reg Type #1 | Reg Type #2 | Reg Type #3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | ... | Reg Type #n | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Padding +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type 936
Length Length in octets, excluding Type, Length, and Padding.
Failure Type Reason for failure.
Reg Type The registration types that failed with the specified
reason.
Failure Type Reason
------------ --------------------------------------------
0 Registration requires additional credentials
1 Registration type unavailable
[TBD-IANA] Insufficient resources
[TBD-IANA] Invalid certificate
[TBD-IANA]-200 Unassigned
201-255 Reserved by IANA for private use
Other documents will define specific values for registration types.
See Section 7 for more information.
Failure type zero (0) indicates that the registrar requires
additional credentials to authorize a requester to register with the
registration types listed in the parameter. Failure type one (1)
indicates that the requested service type is unavailable at the
registrar. Failure type ([TBD-IANA-Insufficient-resources])
indicates that the registrar does not currently have enough resources
to register the requester for the service(s); when that is the case
the requester MUST NOT reattempt immediately to register for the same
service(s), and MAY attempt to contact another registrar to register
for these service(s). Failure type ([TBD-IANA-Invalid-Certificates])
indicates that the registrar could not validate the certificate
provided by the requester to register for the service(s); when that
is the case the requester MUST NOT reattempt to register for the same
set of services while providing the same certificate, and MAY attempt
to register for the same set of service(s) with a different
certificate, or with a different set of service(s) with the same
certificate.
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The registrar SHOULD include a REG_FAILED parameter in its R2 or
UPDATE packet, if registration with the registration types listed has
not completed successfully and a requester is asked to try again with
additional credentials.
HIP_SIGNATURE protects the parameter within the R2 and UPDATE
packets.
5. Establishing and Maintaining Registrations
Establishing and/or maintaining a registration may require additional
information not available in the transmitted REG_REQUEST or
REG_RESPONSE parameters. Therefore, registration type definitions
MAY define dependencies for HIP parameters that are not defined in
this document. Their semantics are subject to the specific
registration type specifications.
The minimum lifetime both registrars and requesters MUST support is
10 seconds, while they SHOULD support a maximum lifetime of 120
seconds, at least. These values define a baseline for the
specification of services based on the registration system. They
were chosen to be neither too short nor too long, and to accommodate
for existing timeouts of state established in middleboxes (e.g., NATs
and firewalls.)
A zero lifetime is reserved for canceling purposes. Requesting a
zero lifetime for a registration type is equal to canceling the
registration of that type. A requester MAY cancel a registration
before it expires by sending a REG_REQ to the registrar with a zero
lifetime. A registrar SHOULD respond and grant a registration with a
zero lifetime. A registrar (and an attached service) MAY cancel a
registration before it expires, at its own discretion. However, if
it does so, it SHOULD send a REG_RESPONSE with a zero lifetime to all
registered requesters.
6. Security Considerations
This section discusses the threats on the HIP registration protocol,
and their implications on the overall security of HIP. In
particular, it argues that the extensions described in this document
do not introduce additional threats to HIP.
The extensions described in this document rely on the HIP base
exchange and do not modify its security characteristics, e.g.,
digital signatures or HMAC. Hence, the only threat introduced by
these extensions is related to the creation of soft registration
state at the registrar.
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Registrars act on a voluntary basis and are willing to accept being a
responder and then to create HIP associations with a number of
potentially unknown hosts. Because they have to store HIP
association state anyway, adding a certain amount of time-limited HIP
registration state should not introduce any serious additional
threats, especially because HIP registrars may cancel registrations
at any time at their own discretion, e.g., because of resource
constraints during an attack.
7. IANA Considerations
This section is to be interpreted according to the Guidelines for
Writing an IANA Considerations Section in RFCs [RFC5226].
This document updates the IANA Registry for HIP Parameters Types by
replacing references to [RFC5203] by references to this document.
This document also updates the registry for registration failure
types by making the following failure type definitions and
reservations:
Failure Type Reason
------------ --------------------------------------------
[TBD-IANA] Insufficient resources
[TBD-IANA] Invalid certificate
8. Contributors
Teemu Koponen co-authored an earlier, experimental version of this
specification [RFC5203].
9. Acknowledgments
The following people (in alphabetical order) have provided thoughtful
and helpful discussions and/or suggestions that have helped to
improve this document: Jeffrey Ahrenholz, Miriam Esteban, Ari
Keranen, Mika Kousa, Pekka Nikander, and Hannes Tschofenig.
Lars Eggert has received funding from the European Union's Horizon
2020 research and innovation program 2014-2018 under grant agreement
No. 644866. This document reflects only the authors' views and the
European Commission is not responsible for any use that may be made
of the information it contains.
Ari Keranen suggested inclusion of the text specifying requester
authorization based on certificates as a direct adaption of text
found in HIP native NAT traversal specification
[I-D.ietf-hip-native-nat-traversal].
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Thanks to Joel M. Halpern for performing the Gen-ART review of this
document as part of the publication process.
10. References
10.1. Normative References
[I-D.ietf-hip-rfc5204-bis]
Laganier, J. and L. Eggert, "Host Identity Protocol (HIP)
Rendezvous Extension", draft-ietf-hip-rfc5204-bis-07 (work
in progress), December 2015.
[I-D.ietf-hip-rfc6253-bis]
Heer, T. and S. Varjonen, "Host Identity Protocol
Certificates", draft-ietf-hip-rfc6253-bis-06 (work in
progress), December 2015.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 5226,
DOI 10.17487/RFC5226, May 2008,
<http://www.rfc-editor.org/info/rfc5226>.
[RFC7401] Moskowitz, R., Ed., Heer, T., Jokela, P., and T.
Henderson, "Host Identity Protocol Version 2 (HIPv2)",
RFC 7401, DOI 10.17487/RFC7401, April 2015,
<http://www.rfc-editor.org/info/rfc7401>.
10.2. Informative References
[I-D.ietf-hip-native-nat-traversal]
Keranen, A. and J. Melen, "Native NAT Traversal Mode for
the Host Identity Protocol", draft-ietf-hip-native-nat-
traversal-10 (work in progress), January 2016.
[I-D.ietf-hip-rfc4423-bis]
Moskowitz, R. and M. Komu, "Host Identity Protocol
Architecture", draft-ietf-hip-rfc4423-bis-13 (work in
progress), December 2015.
[RFC3234] Carpenter, B. and S. Brim, "Middleboxes: Taxonomy and
Issues", RFC 3234, DOI 10.17487/RFC3234, February 2002,
<http://www.rfc-editor.org/info/rfc3234>.
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[RFC5203] Laganier, J., Koponen, T., and L. Eggert, "Host Identity
Protocol (HIP) Registration Extension", RFC 5203,
DOI 10.17487/RFC5203, April 2008,
<http://www.rfc-editor.org/info/rfc5203>.
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Appendix A. Changes from RFC 5203
o Updated references to revised HIP specifications.
o Added a new registration failure type for use in case of
insufficient resources available at the HIP registrar.
o Added requester authorization based on certificates, and new
registration failure type for invalid certificate.
Authors' Addresses
Julien Laganier
Luminate Wireless, Inc.
Cupertino, CA
USA
EMail: julien.ietf@gmail.com
Lars Eggert
NetApp
Sonnenallee 1
Kirchheim 85551
Germany
Phone: +49 151 12055791
EMail: lars@netapp.com
URI: http://eggert.org
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