Split DNS Configuration for IKEv2
draft-ietf-ipsecme-split-dns-02
Network T. Pauly
Internet-Draft Apple Inc.
Intended status: Standards Track P. Wouters
Expires: January 30, 2018 Red Hat
July 29, 2017
Split DNS Configuration for IKEv2
draft-ietf-ipsecme-split-dns-02
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
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This Internet-Draft will expire on January 30, 2018.
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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 . . . . . 6
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 . . . . . . . . . . . . . . . . . . . . . 10
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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