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I'm Being Attacked by PRISONER.IANA.ORG! (RFC6305) Disclosure Number: IPCOM000208663D
Original Publication Date: 2011-Jul-01
Included in the Prior Art Database: 2011-Jul-14
Document File: 16 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Abley: AUTHOR [+1]


information to allow appropriate measures to be taken in response to it.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 18% of the total text.

Internet Engineering Task Force (IETF)                          J. Abley Request for Comments: 6305                                         ICANN Category: Informational                                         W. Maton ISSN: 2070-1721                                                 NRC-CNRC                                                                July 2011

                 I'm Being Attacked by PRISONER.IANA.ORG!


   Many sites connected to the Internet make use of IPv4 addresses that    are not globally unique.  Examples are the addresses designated in    RFC 1918 for private use within individual sites.

   Hosts should never normally send DNS reverse-mapping queries for    those addresses on the public Internet.  However, such queries are    frequently observed.  Authoritative servers are deployed to provide    authoritative answers to such queries as part of a loosely    coordinated effort known as the AS112 project.

   Since queries sent to AS112 servers are usually not intentional, the    replies received back from those servers are typically unexpected.    Unexpected inbound traffic can trigger alarms on intrusion detection    systems and firewalls, and operators of such systems often mistakenly    believe that they are being attacked.

   This document provides background information and technical advice to    those firewall operators.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   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).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see 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

 Abley & Maton                 Informational                     [Page 1]
 RFC 6305        I'm Being Attacked by PRISONER.IANA.ORG!       July 2011

 Copyright Notice

   Copyright (c) 2011 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    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your r...