Configuring IPv6-over-IPv4 Tunnels
If you have a Tunnel PIC installed in your M Series or T Series router, you can configure IPv6-over-IPv4 tunnels. To define a tunnel, you configure a unicast tunnel across an existing IPv4 network infrastructure. IPv6/IPv4 packets are encapsulated in IPv4 headers and sent across the IPv4 infrastructure through the configured tunnel. You manually configure configured tunnels on each end point.
On SRX Series and J Series devices, Generic Routing Encapsulation (GRE) and IP-IP tunnels use internal interfaces, gr-0/0/0 and ip-0/0/0, respectively. The Junos OS creates these interfaces at system bootup; they are not associated with a physical interface.
IPv6-over-IPv4 tunnels are defined in RFC 2893, Transition Mechanisms for IPv6 Hosts and Routers. For information about configuring a unicast tunnel, see Configuring Unicast Tunnels. For an IPv6-over-IPv4 tunnel configuration example, see Example: Configuring an IPv6-over-IPv4 Tunnel.
