R1#sh run | b Tu
interface Tunnel0
 no ip address
 no ip redirects
 ipv6 address 2002:B428:742::/64
 tunnel source Ethernet0/0
 tunnel mode ipv6ip 6to4
!
ipv6 route 2002::/16 Tunnel0


R7#sh run | b Tu
interface Tunnel0
 no ip address
 no ip redirects
 ipv6 address 2002:B428:701::/64
 tunnel source FastEthernet0/1
 tunnel mode ipv6ip 6to4
!
ipv6 route 2002::/16 Tunnel0