The 6to4 tunneling method dynamically applies a valid, unique
IPv6 pre?¬?x to each IPv6 island, which enables the fast deployment of
IPv6 in a corporate network without address retrieval from the ISPs or
registries.
??” Intra-Site Automatic Tunnel Addressing Protocol (ISATAP)
tunneling: An automatic overlay tunneling mechanism that uses the
underlying IPv4 network as a link layer for IPv6. ISATAP tunnels allow
individual IPv4 or IPv6 dual-stack hosts within a site to communicate
with other such hosts on a virtual link, creating an IPv6 network using
the IPv4 infrastructure.
??” Teredo tunneling: An IPv6 transition technology that provides host-tohost
automatic tunneling instead of gateway tunneling. It is used to
pass unicast IPv6 traf?¬?c when dual-stacked hosts (hosts that are running
both IPv6 and IPv4) are located behind one or multiple IPv4 Network
Address Translators.
?– Proxying and translation (NAT-PT): A translation mechanism that sits between an
IPv6 network and an IPv4 network. The job of the translator is to translate IPv6 packets
into IPv4 packets and vice versa.
Dual stack is an integration method in which a node has implementation and connectivity to
both an IPv4 and IPv6 network; thus, the node has two stacks, as illustrated in Figure 7-14.
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