Split DNS Configuration for IKEv2
draft-ietf-ipsecme-split-dns-08

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Network                                                         T. Pauly
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                              P. Wouters
Expires: December 20, 2018                                       Red Hat
                                                           June 18, 2018

                   Split DNS Configuration for IKEv2
                    draft-ietf-ipsecme-split-dns-08

Abstract

   This document defines two Configuration Payload Attribute Types for
   the IKEv2 protocol that add support for private DNS domains.  These
   domains are intended to 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
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   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 December 20, 2018.

Copyright Notice

   Copyright (c) 2018 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 December 20, 2018               [Page 1]
Internet-Draft      Split DNS Configuration for IKEv2          June 2018

   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 . . . . .   6
   4.  Payload Formats . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  INTERNAL_DNS_DOMAIN Configuration Attribute Type Request
           and Reply . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.2.  INTERNAL_DNSSEC_TA Configuration Attribute  . . . . . . .   7
   5.  INTERNAL_DNS_DOMAIN Usage Guidelines  . . . . . . . . . . . .   9
   6.  INTERNAL_DNSSEC_TA Usage Guidelines . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

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