Split DNS Configuration for IKEv2
draft-ietf-ipsecme-split-dns-00
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Active Internet-Draft (ipsecme WG)
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2017-03-29
(latest revision 2017-03-13)
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draft-pauly-ipsecme-split-dns
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IETF
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(None)
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WG state
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WG Document
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Document shepherd |
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David Waltermire
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I-D Exists
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Unknown
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Send notices to |
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David Waltermire <david.waltermire@nist.gov>
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Network T. Pauly
Internet-Draft Apple Inc.
Intended status: Standards Track P. Wouters
Expires: September 14, 2017 Red Hat
March 13, 2017
Split DNS Configuration for IKEv2
draft-ietf-ipsecme-split-dns-00
Abstract
This document defines two Configuration Payload Attribute Types for
the IKEv2 protocol that add support for private DNS domains. These
domains should be resolved using DNS servers reachable through an
IPsec connection, while leaving all other DNS resolution unchanged.
This approach of resolving a subset of domains using non-public DNS
servers is referred to as "Split DNS".
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 14, 2017.
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
Pauly & Wouters Expires September 14, 2017 [Page 1]
Internet-Draft Split DNS Configuration for IKEv2 March 2017
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3
2. Background . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Protocol Exchange . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Configuration Request . . . . . . . . . . . . . . . . . . 4
3.2. Configuration Reply . . . . . . . . . . . . . . . . . . . 4
3.3. Mapping DNS Servers to Domains . . . . . . . . . . . . . 5
3.4. Example Exchanges . . . . . . . . . . . . . . . . . . . . 5
3.4.1. Simple Case . . . . . . . . . . . . . . . . . . . . . 5
3.4.2. Requesting Domains and DNSSEC trust anchors . . . . . 5
4. Payload Formats . . . . . . . . . . . . . . . . . . . . . . . 6
4.1. INTERNAL_DNS_DOMAIN Configuration Attribute Type . . . . 6
4.2. INTERNAL_DNSSEC_TA Configuration Attribute . . . . . . . 7
5. Split DNS Usage Guidelines . . . . . . . . . . . . . . . . . 7
6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1. Normative References . . . . . . . . . . . . . . . . . . 10
8.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
Split DNS is a common configuration for secure tunnels, such as
Virtual Private Networks in which host machines private to an
organization can only be resolved using internal DNS resolvers
[RFC2775]. In such configurations, it is often desirable to only
resolve hosts within a set of private domains using the tunnel, while
letting resolutions for public hosts be handled by a device's default
DNS configuration.
The Internet Key Exchange protocol version 2 [RFC7296] negotiates
configuration parameters using Configuration Payload Attribute Types.
This document defines two Configuration Payload Attribute Types that
add support for trusted Split DNS domains.
The INTERNAL_DNS_DOMAIN attribute type is used to convey one or more
DNS domains that should be resolved only using the provided DNS
nameserver IP addresses, causing these requests to use the IPsec
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