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RFC 6583
Title: Operational Neighbor Discovery Problems
Author: I. Gashinsky, J. Jaeggli,
W. Kumari
Status: Informational
Stream: IETF
Date: March 2012
Mailbox: igor@yahoo-inc.com,
jjaeggli@zynga.com,
warren@kumari.net
Pages: 12
Characters: 29480
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-v6ops-v6nd-problems-04.txt
URL: http://www.rfc-editor.org/rfc/rfc6583.txt
In IPv4, subnets are generally small, made just large enough to cover
the actual number of machines on the subnet. In contrast, the
default IPv6 subnet size is a /64, a number so large it covers
trillions of addresses, the overwhelming number of which will be
unassigned. Consequently, simplistic implementations of Neighbor
Discovery (ND) can be vulnerable to deliberate or accidental denial
of service (DoS), whereby they attempt to perform address resolution
for large numbers of unassigned addresses. Such denial-of-service
attacks can be launched intentionally (by an attacker) or result from
legitimate operational tools or accident conditions. As a result of
these vulnerabilities, new devices may not be able to "join" a
network, it may be impossible to establish new IPv6 flows, and
existing IPv6 transported flows may be interrupted.
This document describes the potential for DoS in detail and suggests
possible implementation improvements as well as operational
mitigation techniques that can, in some cases, be used to protect
against or at least alleviate the impact of such attacks.
[STANDARDS-TRACK]
This document is a product of the IPv6 Operations Working Group of the IETF.
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