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RFC 5943

A Dedicated Routing Policy Specification Language Interface Identifier for Operational Testing

Pages: 4
Proposed Standard

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Internet Engineering Task Force (IETF)                  B. Haberman, Ed.
Request for Comments: 5943                                       JHU APL
Category: Standards Track                                    August 2010
ISSN: 2070-1721


 A Dedicated Routing Policy Specification Language Interface Identifier
                        for Operational Testing

Abstract

The deployment of new IP connectivity typically results in intermittent reachability for numerous reasons that are outside the scope of this document. In order to aid in the debugging of these persistent problems, this document proposes the creation of a new Routing Policy Specification Language attribute that allows a network to advertise an IP address that is reachable and can be used as a target for diagnostic tests (e.g., pings). 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 5741. 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/rfc5943. Copyright Notice Copyright (c) 2010 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.
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Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. RPSL Extension for Diagnostic Address . . . . . . . . . . . . . 2 3. Using the RPSL Pingable Attribute . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 3 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4 6. Normative References . . . . . . . . . . . . . . . . . . . . . 4

1. Introduction

The deployment of new IP connectivity typically results in intermittent reachability for numerous reasons that are outside the scope of this document. In order to aid in the debugging of these persistent problems, this document proposes the creation of a new Routing Policy Specification Language attribute [RFC4012] that allows a network to advertise an IP address that is reachable and can be used as a target for diagnostic tests (e.g., pings). The goal of this diagnostic address is to provide operators a means to advertise selected hosts that can be targets of tests for such common issues as reachability and Path MTU discovery. The capitalized 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 [RFC2119].

2. RPSL Extension for Diagnostic Address

Network operators wishing to provide a diagnostic address for their peers, customers, etc., MAY advertise its existence via the Routing Policy Specification Language [RFC4012] [RFC2622]. The pingable attribute is a member of the route and route6 objects in the RPSL. The definition of the pingable attribute is shown in Figure 1. +-----------+-------------------+--------------+ | Attribute | Value | Type | +-----------+-------------------+--------------+ | pingable | <ipv6-address> or | optional, | | | <ipv4-address> | multi-valued | +-----------+-------------------+--------------+ | ping-hdl | <nic-handle> | optional, | | | | multi-valued | +-----------+-------------------+--------------+ Figure 1: Pingable Attribute Specification
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   The exact definitions of <ipv4-address> and <nic-handle> can be found
   in [RFC2622], while the definition of <ipv6-address> is in [RFC4012].

   The pingable attribute allows a network operator to advertise an IP
   address of a node that should be reachable from outside networks.
   This node can be used as a destination address for diagnostic tests.
   The address specified MUST fall within the IP address range
   advertised in the route/route6 object containing the pingable
   attribute.  The ping-hdl provides a link to contact information for
   an entity capable of responding to queries concerning the specified
   IP address.  An example of using the pingable attribute is shown in
   Figure 2.

   route6: 2001:DB8::/32
   origin: AS64500
   pingable: 2001:DB8::DEAD:BEEF
   ping-hdl: OPS4-RIPE

                   Figure 2: Pingable Attribute Example

3. Using the RPSL Pingable Attribute

The presence of one or more pingable attributes signals to network operators that the operator of the target network is providing the address(es) for external diagnostic testing. Tests involving the advertised address(es) SHOULD be rate limited to no more than ten probes in a five-minute window unless prior arrangements are made with the maintainer of the attribute.

4. Security Considerations

The use of routing registries based on RPSL requires a significant level of security. In-depth discussion of the authentication and authorization capabilities and weaknesses within RPSL is in [RFC2725]. The application of authentication in RPSL is key considering the vulnerabilities that may arise from the abuse of the pingable attribute by nefarious actors. Additional RPSL security issues are discussed in the Security Considerations sections of [RFC2622] and [RFC4012]. The publication of this attribute only explicitly signals the availability of an ICMP Echo Request/Echo Response service on the specified IP address. The operator, at his/her discretion, MAY deploy other services at the same IP address. These services may be impacted by the ping service, given its publicity via the RPSL.
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   While this document specifies that external users of the pingable
   attribute rate limit their probes, there is no guarantee that they
   will do so.  Operators publicizing a pingable attribute are
   encouraged to deploy their own rate limiting for the advertised IP
   address in order to reduce the risk of a denial-of-service attack.
   Services, protocols, and ports on the advertised IP address should be
   filtered if they are not intended for external users.

5. Acknowledgements

Randy Bush and David Farmer provided the original concept for the pingable attribute and useful comments on preliminary versions of this document. Joe Abley provided comments that justified moving the attribute to the route/route6 object and the inclusion of a point of contact. Larry Blunk, Tony Tauber, David Harrington, Nicolas Williams, Sean Turner, and Peter Saint-Andre provided useful comments to improve the document.

6. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2622] Alaettinoglu, C., Villamizar, C., Gerich, E., Kessens, D., Meyer, D., Bates, T., Karrenberg, D., and M. Terpstra, "Routing Policy Specification Language (RPSL)", RFC 2622, June 1999. [RFC2725] Villamizar, C., Alaettinoglu, C., Meyer, D., and S. Murphy, "Routing Policy System Security", RFC 2725, December 1999. [RFC4012] Blunk, L., Damas, J., Parent, F., and A. Robachevsky, "Routing Policy Specification Language next generation (RPSLng)", RFC 4012, March 2005.

Author's Address

Brian Haberman (editor) Johns Hopkins University Applied Physics Lab 11100 Johns Hopkins Road Laurel, MD 20723-6099 US Phone: +1 443 778 1319 EMail: brian@innovationslab.net