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Selectively Isolating Hosts to Prevent Potential Neighbor Discovery Issues and Simplify IPv6 First-hops

Document Type Expired Internet-Draft (v6ops WG)
Expired & archived
Authors XiPeng Xiao , Eduard V , Eduard Metz , Gyan Mishra , Nick Buraglio
Last updated 2024-01-10 (Latest revision 2023-07-09)
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


Neighbor Discovery (ND) is a key protocol of IPv6 first-hop. ND uses multicast extensively and trusts all hosts. In some scenarios like wireless networks, multicast can be inefficient. In other scenarios like public access networks, hosts may not be trustable. Consequently, ND has potential issues in various scenarios. The issues and the solutions for them are documented in more than 30 RFCs. It is difficult to keep track of all these issues and solutions. Therefore, an overview is useful. This document firstly summarizes the known ND issues and optimization solutions into a one-stop reference. Analyzing these solutions reveals an insight: isolating hosts is effective in preventing ND issues. Five isolation methods are proposed and their applicability is discussed. Guidelines are described for selecting a suitable isolation method based on the deployment scenario. When ND issues are prevented with a proper isolation method, the solutions for these issues are not needed. This simplifies the IPv6 first- hops.


XiPeng Xiao
Eduard V
Eduard Metz
Gyan Mishra
Nick Buraglio

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)