Operational Neighbor Discovery Problems
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From: The IESG <email@example.com> To: IETF-Announce <firstname.lastname@example.org> Cc: RFC Editor <email@example.com>, v6ops mailing list <firstname.lastname@example.org>, v6ops chair <email@example.com> Subject: Document Action: 'Operational Neighbor Discovery Problems' to Informational RFC (draft-ietf-v6ops-v6nd-problems-04.txt) The IESG has approved the following document: - 'Operational Neighbor Discovery Problems' (draft-ietf-v6ops-v6nd-problems-04.txt) as an Informational RFC This document is the product of the IPv6 Operations Working Group. The IESG contact persons are Ronald Bonica and Dan Romascanu. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-v6ops-v6nd-problems/
Technical Summary 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 alleviate the impact of such attacks. Working Group Summary The topic was discussed in v6ops, with essentially smooth consensus supporting the document. Document Quality This is a problem statement. As such, one doesn't expect an implementation... Personnel Fred Baker is shepherd.