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Recommendations on Filtering of IPv4 Packets Containing IPv4 Options (RFC7126) Disclosure Number: IPCOM000234856D
Original Publication Date: 2014-Feb-01
Included in the Prior Art Database: 2014-Feb-11
Document File: 72 page(s) / 73K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

F. Gont: AUTHOR [+3]


This document discusses the filtering of IPv4 packets based on the IPv4 options they contain. Since various protocols may use IPv4 options to some extent, dropping packets based on the options they contain may have implications on the proper functioning of such protocols. Therefore, this document attempts to discuss the operational and interoperability implications of such dropping. Additionally, it outlines what a network operator might do in typical enterprise or Service Provider environments. This document also draws and is partly derived from [RFC6274], which also received review from the operational community.

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Internet Engineering Task Force (IETF)                           F. Gont Request for Comments: 7126                        UTN-FRH / SI6 Networks BCP: 186                                                     R. Atkinson Category: Best Current Practice                               Consultant ISSN: 2070-1721                                             C. Pignataro                                                                    Cisco                                                            February 2014

   Recommendations on Filtering of IPv4 Packets Containing IPv4 Options


   This document provides advice on the filtering of IPv4 packets based    on the IPv4 options they contain.  Additionally, it discusses the    operational and interoperability implications of dropping packets    based on the IP options they contain.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   This document is a product of the Internet Engineering Task Force    (IETF).  It has been approved for publication by the Internet    Engineering Steering Group (IESG).  Further information on BCPs 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

Copyright Notice

   Copyright (c) 2014 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 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.

 Gont, et al.              Best Current Practice                 [Page 1]
 RFC 7126            Filtering of IP-Optioned Packets       February 2014

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3

     1.1.  Terminology and Conventions Used in This Document . . . .   3

     1.2.  Operational Focus . . . . . . . . . . . . . . . . . . . .   4

   2.  IP Options  . . . . . . . . . . . . . . . . . . . . . . . . .   4

   3.  General Security Implications of IP Options . . . . . . ....