The IPv6 address of the tunnel source is ::172.168.111.65 and the IPv6 address of the tunnel destination is ::172.168.222.80. These two addresses are IPv4compatible IPv6 addresses, which are addresses that contain the IPv4 addresses of the tunnel source and destination. In automatic IPv4-compatible IPv6 tunnel, the IPv4 addresses of the tunnel source and the tunnel destination are used to determine their IPv6 addresses. The IPv4 addresses of the tunnel source/destination are embedded into the least significant 32 bits of an all-zero unicast IPv6 address. The resultant IPv6 address has zeros in the most significant 96 bits and the IPv4 address of the tunnel source/destination in the remaining 32 bits. In this case, the source of an automatic IPv4-compatible IPv6 tunnel has the IPv6 address 0:0:0:0:0:0:172.168.111.65, abbreviated as ::2.168.111.65. You can also convert this address into pure hexadecimal format, which would be ACA8:6F41. Any of the following three addresses could be used to identify the BGP neighbor at 172.168.11.65: 0:0:0:0:0:0:172.168.111.65 ::172.168.111.65 ::ACA8:6F41 Similarly, the tunnel destination has the IPv6 address 0:0:0:0:0:0:172.168.222.80 (abbreviated as ::172.168.222.80). The hexadecimal form of the IPv6 address of the tunnel destination is ::ACA8:DE50. Any of the following three addresses could be used to identify the BGP neighbor at 172.168.222.80: 0:0:0:0:0:0:172.168.222.80 ::172.168.222.80 ::ACA8:DE50 The other two options state incorrect IPv6 addresses of the tunnel source and the tunnel destination. Both options specify an IPv6 address that has the IPv4 address of the tunnel source/destination in the most significant 32 bits and zeros in the least significant 96 bits. Objective: Network Principles Sub- Objective: Recognize proposed changes to the network References: Home > Support > Technology Support > IP > IP Version 6 (IPv6) > Configure > Configuration Examples and Technotes > IPv6 Tunnel Through an IPv4 Network > Configure > Configurations (Automatic IPv4-Compatible Mode) Cisco IOS IPv6 Implementation Guide > Implementing Tunneling for IPv6 Cisco > Support > Technology Support > IP > IP Version 6 (IPv6) > Technology Information > Technology White Paper > IPv6 Deployment Strategies > Selecting a Deployment Strategy > Deploying IPv6 Over IPv4 Tunnels > Automatic IPv4-Compatible Tunnel
The IPv6 address of the tunnel source is ::172.168.111.65 and the IPv6 address of the tunnel destination is ::172.168.222.80.
These two addresses are IPv4compatible IPv6 addresses, which are addresses that contain the IPv4 addresses of the tunnel source and destination.
In automatic IPv4-compatible IPv6 tunnel, the IPv4 addresses of the tunnel source and the tunnel destination are used to determine their IPv6 addresses. The IPv4 addresses of the tunnel source/destination are embedded into the least significant 32 bits of an all-zero unicast IPv6 address. The resultant IPv6 address has zeros in the most significant 96 bits and the IPv4 address of the tunnel source/destination in the remaining 32 bits.
In this case, the source of an automatic IPv4-compatible IPv6 tunnel has the IPv6 address 0:0:0:0:0:0:172.168.111.65, abbreviated as ::2.168.111.65. You can also convert this address into pure hexadecimal format, which would be ACA8:6F41.
Any of the following three addresses could be used to identify the BGP neighbor at 172.168.11.65:
0:0:0:0:0:0:172.168.111.65
::172.168.111.65
::ACA8:6F41
Similarly, the tunnel destination has the IPv6 address 0:0:0:0:0:0:172.168.222.80 (abbreviated as ::172.168.222.80). The hexadecimal form of the IPv6 address of the tunnel destination is ::ACA8:DE50.
Any of the following three addresses could be used to identify the BGP neighbor at 172.168.222.80:
0:0:0:0:0:0:172.168.222.80
::172.168.222.80
::ACA8:DE50
The other two options state incorrect IPv6 addresses of the tunnel source and the tunnel destination. Both options specify an IPv6 address that has the IPv4 address of the tunnel source/destination in the most significant 32 bits and zeros in the least significant 96 bits.
Objective:
Network
Principles Sub-
Objective:
Recognize proposed changes to the network
References:
Home > Support > Technology Support > IP > IP Version 6 (IPv6) > Configure > Configuration Examples and Technotes > IPv6 Tunnel Through an IPv4 Network >
Configure > Configurations (Automatic IPv4-Compatible Mode)
Cisco IOS IPv6 Implementation Guide > Implementing Tunneling for IPv6
Cisco > Support > Technology Support > IP > IP Version 6 (IPv6) > Technology Information > Technology White Paper > IPv6 Deployment Strategies > Selecting a
Deployment Strategy > Deploying IPv6 Over IPv4 Tunnels > Automatic IPv4-Compatible Tunnel