Operational Security Considerations for IPv6 Networks
draft-ietf-opsec-v6-21
OPSEC E. Vyncke, Ed.
Internet-Draft Cisco
Intended status: Informational K. Chittimaneni
Expires: May 6, 2020 WeWork
M. Kaeo
Double Shot Security
E. Rey
ERNW
November 3, 2019
Operational Security Considerations for IPv6 Networks
draft-ietf-opsec-v6-21
Abstract
Knowledge and experience on how to operate IPv4 securely is
available: whether it is the Internet or an enterprise internal
network. However, IPv6 presents some new security challenges. RFC
4942 describes the security issues in the protocol but network
managers also need a more practical, operations-minded document to
enumerate advantages and/or disadvantages of certain choices.
This document analyzes the operational security issues in several
places of a network (enterprises, service providers and residential
users) and proposes technical and procedural mitigations techniques.
Some very specific places of a network such as the Internet of Things
are not discussed in this document.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 6, 2020.
Vyncke, et al. Expires May 6, 2020 [Page 1]
Internet-Draft OPsec IPv6 November 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Generic Security Considerations . . . . . . . . . . . . . . . 4
2.1. Addressing Architecture . . . . . . . . . . . . . . . . . 4
2.1.1. Use of ULAs . . . . . . . . . . . . . . . . . . . . . 5
2.1.2. Point-to-Point Links . . . . . . . . . . . . . . . . 5
2.1.3. Loopback Addresses . . . . . . . . . . . . . . . . . 5
2.1.4. Statically Configured Addresses . . . . . . . . . . . 5
2.1.5. Temporary Addresses - Privacy Extensions for SLAAC . 6
2.1.6. DHCP/DNS Considerations . . . . . . . . . . . . . . . 7
2.1.7. Using a /64 per host . . . . . . . . . . . . . . . . 7
2.1.8. Privacy consideration of Addresses . . . . . . . . . 7
2.2. Extension Headers . . . . . . . . . . . . . . . . . . . . 8
2.2.1. Order and Repetition of Extension Headers . . . . . . 8
2.2.2. Hop-by-Hop Options Header . . . . . . . . . . . . . . 9
2.2.3. Fragment Header . . . . . . . . . . . . . . . . . . . 9
2.2.4. IP Security Extension Header . . . . . . . . . . . . 9
2.3. Link-Layer Security . . . . . . . . . . . . . . . . . . . 9
2.3.1. ND/RA Rate Limiting . . . . . . . . . . . . . . . . . 10
2.3.2. RA/NA Filtering . . . . . . . . . . . . . . . . . . . 10
2.3.3. Securing DHCP . . . . . . . . . . . . . . . . . . . . 12
2.3.4. 3GPP Link-Layer Security . . . . . . . . . . . . . . 12
2.3.5. SeND and CGA . . . . . . . . . . . . . . . . . . . . 13
2.4. Control Plane Security . . . . . . . . . . . . . . . . . 14
2.4.1. Control Protocols . . . . . . . . . . . . . . . . . . 15
2.4.2. Management Protocols . . . . . . . . . . . . . . . . 15
2.4.3. Packet Exceptions . . . . . . . . . . . . . . . . . . 16
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