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F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Appendix Protocol Reference-6PW100

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Figure 66 IPv6 multicast data transmission through a tunnel
As shown in Figure 66, with a GRE tunnel established between the multicast routers Router A and Router
B, Router A encapsulates the IPv6 multicast data in unicast IPv6 packets, and forwards them to Router B
across the GRE tunnel through unicast routers. Then, Router B strips off the unicast IPv6 header and
continues to forward the IPv6 multicast data down toward the receivers.