B.3 The 6boneThe 6bone is a virtual network that was created in 1996 for reasons similar to the MBone: users with islands of IPv6-capable hosts wanted to connect them together using a virtual network without waiting for all the intermediate routers to become IPv6-capable. As of this writing, it is being phased out in favor of native IPv6 deployment; it is expected that the 6bone will cease to operate by June 2006 [Fink and Hinden 2003]. We cover the 6bone here because the examples still demonstrate configured tunnels. We will expand the example to include dynamic tunnels in Section B.4. Figure B.2 shows an example of two IPv6-capable LANs connected with a tunnel across IPv4-only routers. We show the following numbered steps in this figure: Figure B.2. IPv6-in-IPv4 encapsulation on 6bone.
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