IPv6 Tunnel Broker (RFC3053)
Original Publication Date: 2001-Jan-01
Included in the Prior Art Database: 2019-Feb-14
Internet Society Requests For Comment (RFCs)
A. Durand: AUTHOR [+3]
The motivation for the development of the tunnel broker model is to help early IPv6 adopters to hook up to an existing IPv6 network (e.g., the 6bone) and to get stable, permanent IPv6 addresses and DNS names. The concept of the tunnel broker was first presented at Orlando's IETF in December 1998. Two implementations were demonstrated during the Grenoble IPng & NGtrans interim meeting in February 1999. This memo provides information for the Internet community.
Network Working Group A. Durand Request for Comments: 3053 SUN Microsystems, Inc Category: Informational P. Fasano I. Guardini CSELT S.p.A. D. Lento TIM January 2001
IPv6 Tunnel Broker
Status of this Memo
This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.
Copyright (C) The Internet Society (2001). All Rights Reserved.
The IPv6 global Internet as of today uses a lot of tunnels over the existing IPv4 infrastructure. Those tunnels are difficult to configure and maintain in a large scale environment. The 6bone has proven that large sites and Internet Service Providers (ISPs) can do it, but this process is too complex for the isolated end user who already has an IPv4 connection and would like to enter the IPv6 world. The motivation for the development of the tunnel broker model is to help early IPv6 adopters to hook up to an existing IPv6 network (e.g., the 6bone) and to get stable, permanent IPv6 addresses and DNS names. The concept of the tunnel broker was first presented at Orlando’s IETF in December 1998. Two implementations were demonstrated during the Grenoble IPng & NGtrans interim meeting in February 1999.
The growth of IPv6 networks started mainly using the transport facilities offered by the current Internet. This led to the development of several techniques to manage IPv6 over IPv4 tunnels. At present most of the 6bone network is built using manually configured tunnels over the Internet. The main drawback of this approach is the overwhelming management load for network administrators, who have to perform extensive manual configuration for each tunnel. Several attempts to reduce this management overhead
Durand, et al. Informational [Page 1]
RFC 3053 IPv6 Tunnel Broker January 2001
have already been proposed and each of them presents interesting advantages but also solves different problems than the Tunnel Broker, or poses drawbacks not present in the Tunnel Broker:
- the use of automatic tunnels with IPv4 compatible addresses  is a simple mechanism to establish early IPv6 connectivity among isolated dual-stack hosts and/or routers. The problem with this approach is that it does not solve the address exhaustion problem of IPv4. Also there is a great fear to include the complete IPv4 routing table into the IPv6 world because this would worsen the routing table size problem multiplying it by 5;
- 6over4  is a site local transition mechanism based on the use of IPv4 multicast as a virtual link layer. It does not solve the problem of connecting an isolated user to the global IPv6 Internet;
- 6to4  has been designed to allow isolated IPv6 domains, attached to a wide area network with no native IPv6 support (e.g., the IPv4 Internet), to communicate with other such IPv6 domains with minimal manual configuration. The idea is to embed IPv4 tunnel addresses into the IPv6 prefixes so that any domain...