Method used to configure 6to4 tunnels on the USG2000 and USG5000 series

On the USG2000 series, configure the 6RD tunnel as follows:
USG_A and USG_B are 6to4 routers connected to boundary devices of the IPv6 and IPv4 networks. The IPv4 address of interface GigabitEthernet 1/0/1 connecting USG_A to the IPv4 network is 1.1.1.1/24. The IPv4 address of interface GigabitEthernet 1/0/1 connecting USG_B to the IPv4 network is 1.1.1.2/24. A 6to4 tunnel is established between USG_A and USG_B.

1. Configure the tunnel encapsulation type, source address, destination address, and IPv6 address of the tunnel interface of USG_A.
system-view
[USG] sysname USG_A
[USG_A] ipv6
[USG_A] interface tunnel 1
[USG_A-Tunnel1] tunnel-protocol ipv6-ipv4 6to4
[USG_A-Tunnel1] ipv6 enable
[USG_A-Tunnel1] source 1.1.1.1
[USG_B-Tunnel1] ipv6 address 2002:0101:101::1 48

2. Configure the route connecting USG_B to the IPv6 network.
[USG_A] ipv6 route-static 2002:: 16 tunnel 1

3. Configure the tunnel encapsulation type, source address, destination address, and IPv6 address of the tunnel interface of USG_B.
system-view
[USG] sysname NGFW_B
[USG_B] ipv6
[USG_B] interface tunnel 1
[USG_B-Tunnel1] tunnel-protocol ipv6-ipv4 6to4
[USG_B-Tunnel1] ipv6 enable
[USG_B-Tunnel1] source 1.1.1.2
[USG_B-Tunnel1] ipv6 address 2002:0101:102::2 48

4. Configure the route connecting USG_A to the IPv6 network.
[USG_B] ipv6 route-static 2002:: 16 tunnel 1

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