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IETF RFC 8071
Last modified on Wednesday, February 22nd, 2017
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Internet Engineering Task Force (IETF) K. Watsen
Request for Comments: 8071 Juniper Networks
Category: Standards Track February 2017
ISSN: 2070-1721
NETCONF Call Home and RESTCONF Call Home
 Abstract
This RFC presents NETCONF Call Home and RESTCONF Call Home, which
enable a NETCONF or RESTCONF server to initiate a secure connection
to a NETCONF or RESTCONF client, respectively.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/RFC 8071.
Copyright Notice
Copyright (c) 2017 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
(http://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 and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Watsen Standards Track PAGE 1 
RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Requirements Terminology . . . . . . . . . . . . . . . . 3
1.3. Applicability Statement . . . . . . . . . . . . . . . . . 4
1.4. Relation to RFC 4253 . . . . . . . . . . . . . . . . . . 4
1.5. The NETCONF/RESTCONF Convention . . . . . . . . . . . . . 4
2. Solution Overview . . . . . . . . . . . . . . . . . . . . . . 5
3. The NETCONF or RESTCONF Client . . . . . . . . . . . . . . . 5
3.1. Client Protocol Operation . . . . . . . . . . . . . . . . 5
3.2. Client Configuration Data Model . . . . . . . . . . . . . 7
4. The NETCONF or RESTCONF Server . . . . . . . . . . . . . . . 7
4.1. Server Protocol Operation . . . . . . . . . . . . . . . . 7
4.2. Server Configuration Data Model . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1. Normative References . . . . . . . . . . . . . . . . . . 11
7.2. Informative References . . . . . . . . . . . . . . . . . 12
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 13
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 13
1. Introduction
This RFC presents NETCONF Call Home and RESTCONF Call Home, which
enable a NETCONF or RESTCONF server to initiate a secure connection
to a NETCONF or RESTCONF client, respectively.
NETCONF Call Home supports both of the secure transports used by the
Network Configuration Protocol (NETCONF) [RFC 6241], Secure Shell
(SSH), and Transport Layer Security (TLS). The NETCONF protocol's
binding to SSH is defined in [RFC 6242]. The NETCONF protocol's
binding to TLS is defined in [RFC 7589].
RESTCONF Call Home only supports TLS, the same as the RESTCONF
protocol [RFC 8040]. The RESTCONF protocol's binding to TLS is
defined in [RFC 8040].
The SSH protocol is defined in [RFC 4253]. The TLS protocol is
defined in [RFC 5246]. Both the SSH and TLS protocols are layered on
top of the TCP protocol, which is defined in [RFC 793].
Both NETCONF Call Home and RESTCONF Call Home preserve all but one of
the client/server roles in their respective protocol stacks, as
compared to client-initiated NETCONF and RESTCONF connections. The
one and only role reversal that occurs is at the TCP layer; that is,
which peer is the TCP client and which is the TCP server.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
For example, a network element is traditionally the TCP server.
However, when calling home, the network element initially assumes the
role of the TCP client. The network element's secure transport-layer
roles (SSH server, TLS server) and its application-layer roles
(NETCONF server, RESTCONF server) all remain the same.
Having consistency in both the secure transport-layer (SSH, TLS) and
application-layer (NETCONF, RESTCONF) roles conveniently enables
deployed network management infrastructure to support call home also.
For instance, existing certificate chains and user authentication
mechanisms are unaffected by call home.
1.1. Motivation
Call home is generally useful for both the initial deployment and
ongoing management of networking elements. Here are some scenarios
enabled by call home:
o The network element may proactively "call home" after being
powered on for the first time in order to register itself with its
management system.
o The network element may access the network in a way that
dynamically assigns it an IP address, but does not register its
assigned IP address to a mapping service (e.g., dynamic DNS).
o The network element may be deployed behind a firewall that
implements Network Address Translation (NAT) for all internal
network IP addresses.
o The network element may be deployed behind a firewall that does
not allow any management access to the internal network.
o The network element may be configured in "stealth mode", and thus
does not have any open ports for the management system to connect
to.
o The operator may prefer to have network elements initiate
management connections, believing it is easier to secure one open
port in the data center than to have an open port on each network
element in the network.
1.2. Requirements Terminology
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 [RFC 2119].
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
1.3. Applicability Statement
The techniques described in this document are suitable for network
management scenarios such as the ones described in Section 1.1.
However, these techniques are only defined for NETCONF Call Home and
RESTCONF Call Home, as described in this document.
The reason for this restriction is that different protocols have
different security assumptions. The NETCONF and RESTCONF protocols
require clients and servers to verify the identity of the other
party. This requirement is specified for the NETCONF protocol in
Section 2.2 of [RFC 6241], and is specified for the RESTCONF protocol
in Sections 2.4 and 2.5 of [RFC 8040].
This contrasts with the base SSH and TLS protocols, which do not
require programmatic verification of the other party (Section 9.3.4
of [RFC 4251], Section 4 of [RFC 4252], and Section 7.3 of [RFC 5246]).
In such circumstances, allowing the SSH/TLS server to contact the
SSH/TLS client would open new vulnerabilities. Any use of call home
with SSH/TLS for purposes other than NETCONF or RESTCONF will need a
thorough contextual risk assessment. A risk assessment for this RFC
is in the Security Considerations section (Section 5).
1.4. Relation to RFC 4253
This document uses the SSH Transport Layer Protocol [RFC 4253] with
the exception that the statement "The client initiates the
connection" made in Section 4 of RFC 4253 does not apply. Assuming
the reference to the client means "SSH client" and the reference to
the connection means "TCP connection", this statement doesn't hold
true in call home, where the network element is the SSH server and
yet still initiates the TCP connection. Security implications
related to this change are discussed in Section 5.
1.5. The NETCONF/RESTCONF Convention
Throughout the remainder of this document, the term "NETCONF/
RESTCONF" is used as an abbreviation in place of the text "the
NETCONF or the RESTCONF". The NETCONF/RESTCONF abbreviation is not
intended to require or to imply that a client or server must
implement both the NETCONF standard and the RESTCONF standard.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
2. Solution Overview
The diagram below illustrates call home from a protocol-layering
perspective:
NETCONF/RESTCONF NETCONF/RESTCONF
Server Client
| |
| 1. TCP |
|----------------------------------->|
| |
| |
| 2. SSH/TLS |
|<-----------------------------------|
| |
| |
| 3. NETCONF/RESTCONF |
|<-----------------------------------|
| |
Note: Arrows point from the "client" to
the "server" at each protocol layer.
Figure 1: Call Home Sequence Diagram
This diagram makes the following points:
1. The NETCONF/RESTCONF server begins by initiating a TCP connection
to the NETCONF/RESTCONF client.
2. Using this TCP connection, the NETCONF/RESTCONF client initiates
an SSH/TLS session to the NETCONF/RESTCONF server.
3. Using this SSH/TLS session, the NETCONF/RESTCONF client initiates
a NETCONF/RESTCONF session to the NETCONF/RESTCONF server.
3. The NETCONF or RESTCONF Client
The term "client" is defined in [RFC 6241], Section 1.1. In the
context of network management, the NETCONF/RESTCONF client might be a
network management system.
3.1. Client Protocol Operation
C1 The NETCONF/RESTCONF client listens for TCP connection requests
from NETCONF/RESTCONF servers. The client MUST support accepting
TCP connections on the IANA-assigned ports defined in Section 6,
but MAY be configured to listen to a different port.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
C2 The NETCONF/RESTCONF client accepts an incoming TCP connection
request and a TCP connection is established.
C3 Using this TCP connection, the NETCONF/RESTCONF client starts
either the SSH client [RFC 4253] or the TLS client [RFC 5246]
protocol. For example, assuming the use of the IANA-assigned
ports, the SSH client protocol is started when the connection is
accepted on port 4334 and the TLS client protocol is started when
the connection is accepted on either port 4335 or port 4336.
C4 When using TLS, the NETCONF/RESTCONF client MUST advertise
"peer_allowed_to_send", as defined by [RFC 6520]. This is
required so that NETCONF/RESTCONF servers can depend on it being
there for call home connections, when keep-alives are needed the
most.
C5 As part of establishing an SSH or TLS connection, the NETCONF/
RESTCONF client MUST validate the server's presented host key or
certificate. This validation MAY be accomplished by certificate
path validation or by comparing the host key or certificate to a
previously trusted or "pinned" value. If a certificate is
presented and it contains revocation-checking information, the
NETCONF/RESTCONF client SHOULD check the revocation status of the
certificate. If it is determined that a certificate has been
revoked, the client MUST immediately close the connection.
C6 If certificate path validation is used, the NETCONF/RESTCONF
client MUST ensure that the presented certificate has a valid
chain of trust to a preconfigured issuer certificate, and that
the presented certificate encodes an "identifier" [RFC 6125] that
the client was aware of before the connection attempt. How
identifiers are encoded in certificates MAY be determined by a
policy associated with the certificate's issuer. For instance, a
given issuer may be known to only sign IDevID certificates
[Std-802.1AR-2009] having a unique identifier (e.g., a serial
number) in the X.509 certificate's "CommonName" field.
C7 After the server's host key or certificate is validated, the SSH
or TLS protocol proceeds as normal to establish an SSH or TLS
connection. When performing client authentication with the
NETCONF/RESTCONF server, the NETCONF/RESTCONF client MUST only
use credentials that it had previously associated for the
NETCONF/RESTCONF server's presented host key or server
certificate.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
C8 Once the SSH or TLS connection is established, the NETCONF/
RESTCONF client starts either the NETCONF client [RFC 6241] or
RESTCONF client [RFC 8040] protocol. Assuming the use of the
IANA-assigned ports, the NETCONF client protocol is started when
the connection is accepted on either port 4334 or port 4335 and
the RESTCONF client protocol is started when the connection is
accepted on port 4336.
3.2. Client Configuration Data Model
How a NETCONF or RESTCONF client is configured is outside the scope
of this document. For instance, such a configuration might be used
to enable listening for call home connections, configuring trusted
certificate issuers, or configuring identifiers for expected
connections. That said, YANG [RFC 7950] data modules for configuring
NETCONF and RESTCONF clients, including call home, are provided in
[NETCONF-MODELS] and [RESTCONF-MODELS].
4. The NETCONF or RESTCONF Server
The term "server" is defined in [RFC 6241], Section 1.1. In the
context of network management, the NETCONF/RESTCONF server might be a
network element or a device.
4.1. Server Protocol Operation
S1 The NETCONF/RESTCONF server initiates a TCP connection request to
the NETCONF/RESTCONF client. The source port may be per local
policy or randomly assigned by the operating system. The server
MUST support connecting to one of the IANA-assigned ports defined
in Section 6, but MAY be configured to connect to a different
port. Using the IANA-assigned ports, the server connects to port
4334 for NETCONF over SSH, port 4335 for NETCONF over TLS, and
port 4336 for RESTCONF over TLS.
S2 The TCP connection request is accepted and a TCP connection is
established.
S3 Using this TCP connection, the NETCONF/RESTCONF server starts
either the SSH server [RFC 4253] or the TLS server [RFC 5246]
protocol, depending on how it is configured. For example,
assuming the use of the IANA-assigned ports, the SSH server
protocol is used after connecting to the remote port 4334 and the
TLS server protocol is used after connecting to either remote
port 4335 or remote port 4336.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
S4 As part of establishing the SSH or TLS connection, the NETCONF/
RESTCONF server will send its host key or certificate to the
client. If a certificate is sent, the server MUST also send all
intermediate certificates leading up to a well-known and trusted
issuer. How to send a list of certificates is defined for SSH in
[RFC 6187], Section 2.1, and for TLS in [RFC 5246], Section 7.4.2.
S5 Establishing an SSH or TLS session requires server authentication
of client credentials in all cases except with RESTCONF, where
some client authentication schemes occur after the secure
transport connection (TLS) has been established. If transport-
level (SSH or TLS) client authentication is required, and the
client is unable to successfully authenticate itself to the
server in an amount of time defined by local policy, the server
MUST close the connection.
S6 Once the SSH or TLS connection is established, the NETCONF/
RESTCONF server starts either the NETCONF server [RFC 6241] or
RESTCONF server [RFC 8040] protocol, depending on how it is
configured. Assuming the use of the IANA-assigned ports, the
NETCONF server protocol is used after connecting to remote port
4334 or remote port 4335, and the RESTCONF server protocol is
used after connecting to remote port 4336.
S7 If a persistent connection is desired, the NETCONF/RESTCONF
server, as the connection initiator, SHOULD actively test the
aliveness of the connection using a keep-alive mechanism. For
TLS-based connections, the NETCONF/RESTCONF server SHOULD send
HeartbeatRequest messages, as defined by [RFC 6520]. For SSH-
based connections, per Section 4 of [RFC 4254], the server SHOULD
send an SSH_MSG_GLOBAL_REQUEST message with a purposely
nonexistent "request name" value (e.g., keepalive@ietf.org) and
the "want reply" value set to '1'.
4.2. Server Configuration Data Model
How a NETCONF or RESTCONF server is configured is outside the scope
of this document. This includes configuration that might be used to
specify hostnames, IP addresses, ports, algorithms, or other relevant
parameters. That said, YANG [RFC 7950] data modules for configuring
NETCONF and RESTCONF servers, including call home, are provided in
[NETCONF-MODELS] and [RESTCONF-MODELS].
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
5. Security Considerations
The security considerations described in [RFC 6242] and [RFC 7589], and
by extension [RFC 4253], [RFC 5246], and [RFC 8040] apply here as well.
This RFC deviates from standard SSH and TLS usage by having the SSH/
TLS server initiate the underlying TCP connection. This reversal is
incongruous with [RFC 4253], which says "the client initiates the
connection" and also [RFC 6125], which says "the client MUST construct
a list of acceptable reference identifiers, and MUST do so
independently of the identifiers presented by the service."
Risks associated with these variances are centered around server
authentication and the inability for clients to compare an
independently constructed reference identifier to one presented by
the server. To mitigate against these risks, this RFC requires that
the NETCONF/RESTCONF client validate the server's SSH host key or
certificate, by certificate path validation to a preconfigured issuer
certificate, or by comparing the host key or certificate to a
previously trusted or "pinned" value. Furthermore, when a
certificate is used, this RFC requires that the client be able to
match an identifier encoded in the presented certificate with an
identifier the client was preconfigured to expect (e.g., a serial
number).
For cases when the NETCONF/RESTCONF server presents an X.509
certificate, NETCONF/RESTCONF clients should ensure that the
preconfigured issuer certificate used for certificate path validation
is unique to the manufacturer of the server. That is, the
certificate should not belong to a third-party certificate authority
that might issue certificates for more than one manufacturer. This
is especially important when a client authentication mechanism
passing a shared secret (e.g., a password) to the server is used.
Not doing so could otherwise lead to a case where the client sends
the shared secret to another server that happens to have the same
identity (e.g., a serial number) as the server the client was
configured to expect.
Considerations not associated with server authentication follow next.
Internet-facing hosts running NETCONF Call Home or RESTCONF Call Home
will be fingerprinted via scanning tools such as "zmap" [zmap]. Both
SSH and TLS provide many ways in which a host can be fingerprinted.
SSH and TLS servers are fairly mature and able to withstand attacks,
but SSH and TLS clients may not be as robust. Implementers and
deployments need to ensure that software update mechanisms are
provided so that vulnerabilities can be fixed in a timely fashion.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
An attacker could launch a denial-of-service (DoS) attack on the
NETCONF/RESTCONF client by having it perform computationally
expensive operations, before deducing that the attacker doesn't
possess a valid key. For instance, in TLS 1.3 [TLS1.3], the
ClientHello message contains a Key Share value based on an expensive
asymmetric key operation. Common precautions mitigating DoS attacks
are recommended, such as temporarily blacklisting the source address
after a set number of unsuccessful login attempts.
When using call home with the RESTCONF protocol, special care is
required when using some HTTP authentication schemes, especially the
Basic [RFC 7617] and Digest [RFC 7616] schemes, which convey a shared
secret (e.g., a password). Implementers and deployments should be
sure to review the Security Considerations section in the RFC for any
HTTP client authentication scheme used.
6. IANA Considerations
IANA has assigned three TCP port numbers in the "User Ports" range
with the service names "netconf-ch-ssh", "netconf-ch-tls", and
"restconf-ch-tls". These ports will be the default ports for NETCONF
Call Home and RESTCONF Call Home protocols. Below is the
registration template following the rules in [RFC 6335].
Service Name: netconf-ch-ssh
Port Number: 4334
Transport Protocol(s): TCP
Description: NETCONF Call Home (SSH)
Assignee: IESG <iesg@ietf.org>
Contact: IETF Chair <chair@ietf.org>
Reference: RFC 8071
Service Name: netconf-ch-tls
Port Number: 4335
Transport Protocol(s): TCP
Description: NETCONF Call Home (TLS)
Assignee: IESG <iesg@ietf.org>
Contact: IETF Chair <chair@ietf.org>
Reference: RFC 8071
Service Name: restconf-ch-tls
Port Number: 4336
Transport Protocol(s): TCP
Description: RESTCONF Call Home (TLS)
Assignee: IESG <iesg@ietf.org>
Contact: IETF Chair <chair@ietf.org>
Reference: RFC 8071
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
7. References
7.1. Normative References
[RFC 793] Postel, J., "Transmission Control Protocol", STD 7,
RFC 793, DOI 10.17487/RFC 793, September 1981,
<http://www.rfc-editor.org/info/RFC 793>.
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC 2119, March 1997,
<http://www.rfc-editor.org/info/RFC 2119>.
[RFC 4251] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
Protocol Architecture", RFC 4251, DOI 10.17487/RFC 4251,
January 2006, <http://www.rfc-editor.org/info/RFC 4251>.
[RFC 4252] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
Authentication Protocol", RFC 4252, DOI 10.17487/RFC 4252,
January 2006, <http://www.rfc-editor.org/info/RFC 4252>.
[RFC 4253] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
Transport Layer Protocol", RFC 4253, DOI 10.17487/RFC 4253,
January 2006, <http://www.rfc-editor.org/info/RFC 4253>.
[RFC 4254] Ylonen, T. and C. Lonvick, Ed., "The Secure Shell (SSH)
Connection Protocol", RFC 4254, DOI 10.17487/RFC 4254,
January 2006, <http://www.rfc-editor.org/info/RFC 4254>.
[RFC 5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246,
DOI 10.17487/RFC 5246, August 2008,
<http://www.rfc-editor.org/info/RFC 5246>.
[RFC 6125] Saint-Andre, P. and J. Hodges, "Representation and
Verification of Domain-Based Application Service Identity
within Internet Public Key Infrastructure Using X.509
(PKIX) Certificates in the Context of Transport Layer
Security (TLS)", RFC 6125, DOI 10.17487/RFC 6125, March
2011, <http://www.rfc-editor.org/info/RFC 6125>.
[RFC 6187] Igoe, K. and D. Stebila, "X.509v3 Certificates for Secure
Shell Authentication", RFC 6187, DOI 10.17487/RFC 6187,
March 2011, <http://www.rfc-editor.org/info/RFC 6187>.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
[RFC 6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed.,
and A. Bierman, Ed., "Network Configuration Protocol
(NETCONF)", RFC 6241, DOI 10.17487/RFC 6241, June 2011,
<http://www.rfc-editor.org/info/RFC 6241>.
[RFC 6242] Wasserman, M., "Using the NETCONF Protocol over Secure
Shell (SSH)", RFC 6242, DOI 10.17487/RFC 6242, June 2011,
<http://www.rfc-editor.org/info/RFC 6242>.
[RFC 6335] Cotton, M., Eggert, L., Touch, J., Westerlund, M., and S.
Cheshire, "Internet Assigned Numbers Authority (IANA)
Procedures for the Management of the Service Name and
Transport Protocol Port Number Registry", BCP 165,
RFC 6335, DOI 10.17487/RFC 6335, August 2011,
<http://www.rfc-editor.org/info/RFC 6335>.
[RFC 6520] Seggelmann, R., Tuexen, M., and M. Williams, "Transport
Layer Security (TLS) and Datagram Transport Layer Security
(DTLS) Heartbeat Extension", RFC 6520,
DOI 10.17487/RFC 6520, February 2012,
<http://www.rfc-editor.org/info/RFC 6520>.
[RFC 7589] Badra, M., Luchuk, A., and J. Schoenwaelder, "Using the
NETCONF Protocol over Transport Layer Security (TLS) with
Mutual X.509 Authentication", RFC 7589,
DOI 10.17487/RFC 7589, June 2015,
<http://www.rfc-editor.org/info/RFC 7589>.
[RFC 8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
Protocol", RFC 8040, DOI 10.17487/RFC 8040, January 2017,
<http://www.rfc-editor.org/info/RFC 8040>.
7.2. Informative References
[NETCONF-MODELS]
Watsen, K., Wu, G., and J. Schoenwaelder, "NETCONF Client
and Server Models", Work in Progress, draft-ietf-netconf-
netconf-client-server-01, November 2016.
[RESTCONF-MODELS]
Watsen, K. and J. Schoenwaelder, "RESTCONF Client and
Server Models", Work in Progress draft-ietf-netconf-
restconf-client-server-01, November 2016.
[RFC 7616] Shekh-Yusef, R., Ed., Ahrens, D., and S. Bremer, "HTTP
Digest Access Authentication", RFC 7616,
DOI 10.17487/RFC 7616, September 2015,
<http://www.rfc-editor.org/info/RFC 7616>.
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RFC 8071 NETCONF Call Home and RESTCONF Call Home February 2017
[RFC 7617] Reschke, J., "The 'Basic' HTTP Authentication Scheme",
RFC 7617, DOI 10.17487/RFC 7617, September 2015,
<http://www.rfc-editor.org/info/RFC 7617>.
[RFC 7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
RFC 7950, DOI 10.17487/RFC 7950, August 2016,
<http://www.rfc-editor.org/info/RFC 7950>.
[Std-802.1AR-2009]
IEEE, "IEEE Standard for Local and metropolitan area
networks - Secure Device Identity", IEEE Std 802.1AR-2009,
DOI 10.1109/IEEESTD.2009.5367679, December 2009,
<http://standards.ieee.org/findstds/
standard/802.1AR-2009.html>.
[TLS1.3] Rescorla, E., "The Transport Layer Security (TLS) Protocol
Version 1.3", Work in Progress, draft-ietf-tls-tls13-18,
October 2016.
[zmap] Durumeric, Z., Wustrow, E., and J. Halderman, "ZMap: Fast
Internet-Wide Scanning and its Security Applications",
22nd Usenix Security Symposium, August 2013,
<https://zmap.io/paper.html>.
Acknowledgements
The author would like to thank the following (ordered by last name)
for lively discussions on the mailing list and in the halls: Jari
Arkko, Andy Bierman, Martin Bjorklund, Ben Campbell, Spencer Dawkins,
Mehmet Ersue, Stephen Farrell, Wes Hardaker, Stephen Hanna, David
Harrington, Jeffrey Hutzelman, Simon Josefsson, Radek Krejci, Suresh
Krishnan, Barry Leiba, Alan Luchuk, Kathleen Moriarty, Mouse, Russ
Mundy, Tom Petch, Peter Saint-Andre, Joseph Salowey, Juergen
Schoenwaelder, Martin Stiemerling, Joe Touch, Hannes Tschofenig, Sean
Turner, and Bert Wijnen.
Author's Address
Kent Watsen
Juniper Networks
Email: kwatsen@juniper.net
Watsen Standards Track PAGE 13
RFC TOTAL SIZE: 31226 bytes
PUBLICATION DATE: Wednesday, February 22nd, 2017
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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