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IPv6 Overview
118428-A Rev. A 1-25
5. Router J decapsulates the packet.
Note that unlike a configured tunnel, which is a permanent point-to-point link in
the IPv6 topology, an automatic tunnel is a dynamic mechanism, created by the
encapsulating end point for the purpose forwarding an IPv6 packet. After the
packet reaches its destination, the automatic tunnel no longer exists.
Semiautomatic IPv4 Tunnel
A semiautomatic tunnel acts as a static tunnel for outgoing traffic and as an
automatic (multipoint-to-point) tunnel for incoming traffic.
IPv6 Tunnels
Like an IPv4 tunnel, an IPv6 tunnel can be a static tunnel, an automatic tunnel, or
a semiautomatic tunnel.
Packet Forwarding
IPv6 forwards
• Unicast packets not addressed to itself.
• Packets with predefined multicast addresses.
• Packets addressed to itself that include a routing source extension header. The
extension header specifies a list of one or more intermediate nodes that define
a path for the packet to follow through the network to its destination.
IPv6 processes packets that are addressed to itself (with the exception of packets
that contain a routing option extension header). IPv6 recognizes the following
addresses as identifying itself:
• A unicast address assigned to the router
• A loopback address used by a node to send an IPv6 datagram to itself
• An all-nodes or all-hosts multicast address
• An anycast address assigned to the router
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