Recommendations on Filtering of IPv4 Packets Containing IPv4 Options
RFC 7126
Document | Type |
RFC - Best Current Practice
(February 2014; Errata)
Also known as BCP 186
|
|
---|---|---|---|
Authors | Fernando Gont , R. Atkinson , Carlos Pignataro | ||
Last updated | 2019-08-01 | ||
Replaces | draft-gont-opsec-ip-options-filtering | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Chittimaneni Kk | ||
Shepherd write-up | Show (last changed 2013-08-22) | ||
IESG | IESG state | RFC 7126 (Best Current Practice) | |
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Joel Jaeggli | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | No IANA Actions |
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 Abstract 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 http://www.rfc-editor.org/info/rfc7126. 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 (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. 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 . . . . . . . . . 5 3.1. Processing Requirements . . . . . . . . . . . . . . . . . 5 4. Advice on the Handling of Packets with Specific IP Options . 7 4.1. End of Option List (Type = 0) . . . . . . . . . . . . . . 7 4.2. No Operation (Type = 1) . . . . . . . . . . . . . . . . . 7 4.3. Loose Source and Record Route (LSRR) (Type = 131) . . . . 8 4.4. Strict Source and Record Route (SSRR) (Type = 137) . . . 10 4.5. Record Route (Type = 7) . . . . . . . . . . . . . . . . . 11 4.6. Stream Identifier (Type = 136) (obsolete) . . . . . . . . 12 4.7. Internet Timestamp (Type = 68) . . . . . . . . . . . . . 13 4.8. Router Alert (Type = 148) . . . . . . . . . . . . . . . . 14 4.9. Probe MTU (Type = 11) (obsolete) . . . . . . . . . . . . 15 4.10. Reply MTU (Type = 12) (obsolete) . . . . . . . . . . . . 16 4.11. Traceroute (Type = 82) . . . . . . . . . . . . . . . . . 16 4.12. DoD Basic Security Option (Type = 130) . . . . . . . . . 17 4.13. DoD Extended Security Option (Type = 133) . . . . . . . . 20 4.14. Commercial IP Security Option (CIPSO) (Type = 134) . . . 22 4.15. VISA (Type = 142) . . . . . . . . . . . . . . . . . . . . 23 4.16. Extended Internet Protocol (Type = 145) . . . . . . . . . 24 4.17. Address Extension (Type = 147) . . . . . . . . . . . . . 25 4.18. Sender Directed Multi-Destination Delivery (Type = 149) . 25 4.19. Dynamic Packet State (Type = 151) . . . . . . . . . . . . 26 4.20. Upstream Multicast Pkt. (Type = 152) . . . . . . . . . . 26 4.21. Quick-Start (Type = 25) . . . . . . . . . . . . . . . . . 27 4.22. RFC3692-Style Experiment (Types = 30, 94, 158, and 222) . 28 4.23. Other IP Options . . . . . . . . . . . . . . . . . . . . 29 5. Security Considerations . . . . . . . . . . . . . . . . . . . 31 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 31 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 31 7.1. Normative References . . . . . . . . . . . . . . . . . . 31 7.2. Informative References . . . . . . . . . . . . . . . . . 32 Gont, et al. Best Current Practice [Page 2] RFC 7126 Filtering of IP-Optioned Packets February 2014 1. Introduction This document discusses the filtering of IPv4 packets based on theShow full document text