A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the IPv6 Operations Working Group of the IETF. Title : Operational Neighbor Discovery Problems Author(s) : Warren Kumari Filename : draft-ietf-v6ops-v6nd-problems-00.txt Pages : 13 Date : 2011-10-24 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 can be vulnerable to deliberate or accidental denial of service, whereby they attempt to perform address resolution for large numbers of unassigned addresses. Such denial of 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 aleviate the impact of such attacks. A URL for this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-v6ops-v6nd-problems-00.txt Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ This Internet-Draft can be retrieved at: ftp://ftp.ietf.org/internet-drafts/draft-ietf-v6ops-v6nd-problems-00.txt _______________________________________________ I-D-Announce mailing list I-D-Announce@ietf.org https://www.ietf.org/mailman/listinfo/i-d-announce Internet-Draft directories: http://www.ietf.org/shadow.html or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
