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
|
|
|---|---|---|---|
| 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 the
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