Dynamic Host Configuration Protocol (DHCPv4) Configuration of IPsec Tunnel Mode
RFC 3456
Network Working Group B. Patel
Request for Comments: 3456 Intel Corp
Category: Standards Track B. Aboba
Microsoft
S. Kelly
Airespace
V. Gupta
Sun Microsystems, Inc.
January 2003
Dynamic Host Configuration Protocol (DHCPv4)
Configuration of IPsec Tunnel Mode
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This memo explores the requirements for host configuration in IPsec
tunnel mode, and describes how the Dynamic Host Configuration
Protocol (DHCPv4) may be leveraged for configuration. In many remote
access scenarios, a mechanism for making the remote host appear to be
present on the local corporate network is quite useful. This may be
accomplished by assigning the host a "virtual" address from the
corporate network, and then tunneling traffic via IPsec from the
host's ISP-assigned address to the corporate security gateway. In
IPv4, DHCP provides for such remote host configuration.
Patel, et. al. Standards Track [Page 1]
RFC 3456 DHCPv4 Config. of IPsec Tunnel Mode January 2003
Table of Contents
1. Introduction................................................... 2
1.1 Terminology................................................. 2
1.2 Requirements Language....................................... 3
2. IPsec tunnel mode configuration requirements................... 3
2.1 DHCP configuration evaluation............................... 3
2.2 Summary..................................................... 4
3. Scenario overview.............................................. 4
3.1 Configuration walk-through.................................. 5
4. Detailed description........................................... 6
4.1 DHCPDISCOVER message processing............................. 6
4.2 DHCP Relay behavior......................................... 9
4.3 DHCPREQUEST message processing.............................. 10
4.4 DHCPACK message processing.................................. 10
4.5 Configuration policy........................................ 11
5. Security Considerations........................................ 11
6. IANA Considerations............................................ 12
7. Intellectual Property Statement................................ 12
8. References..................................................... 13
8.1 Normative References........................................ 13
8.2 Informative References...................................... 13
9. Acknowledgments................................................ 14
Appendix - IKECFG evaluation...................................... 15
Authors' Addresses................................................ 17
Full Copyright Statement ......................................... 18
1. Introduction
In many remote access scenarios, a mechanism for making the remote
host appear to be present on the local corporate network is quite
useful. This may be accomplished by assigning the host a "virtual"
address from the corporate network, and then tunneling traffic via
IPsec from the host's ISP-assigned address to the corporate security
gateway. In IPv4, Dynamic Host Configuration Protocol (DHCP) [3]
provides for such remote host configuration. This document explores
the requirements for host configuration in IPsec tunnel mode, and
describes how DHCPv4 may be leveraged for configuration.
1.1. Terminology
This document uses the following terms:
DHCP client
A DHCP client or "client" is an Internet host using DHCP to
obtain configuration parameters such as a network address.
Patel, et. al. Standards Track [Page 2]
RFC 3456 DHCPv4 Config. of IPsec Tunnel Mode January 2003
DHCP server
A DHCP server or "server" is an Internet host that returns
configuration parameters to DHCP clients.
1.2. Requirements language
In this document, the key words "MAY", "MUST, "MUST NOT", "optional",
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