IPv4 compatible with IPv6 tunnel configuration
R1#config t
R1 (config) # interface fa0/0
R1 (config-if) # ip add 8.1.1.1 255.255.255.0
R1 (config-if) # no shut
R1 (config-if) # exit
R1 (config) # interface loopback 0
R1 (config-if) # ipv6 enable
R1 (config-if) # ipv6 address 2001 Virgo 1hand 96
R1 (config-if) # no shut
R1 (config-if) # exit
R1 (config) # interface tunnel 0
R1 (config-if) # ipv6 enable
R1 (config-if) # tunnel mode ipv6ip auto
R1 (config-if) # tunnel source fa0/0
R1 (config-if) # no shut
R1 (config-if) # exit
R1 (config) # ip routing
R1 (config) # ip route 9.1.1.0 255.255.255.08.1.1.2
R1 (config) # ipv6 unicast-routing
R1 (config) # ipv6route 2002 VOLGROGRAPH 96:: 9.1.1.1
R1 (config) # ^ Z
R1#
R1#sh ipv6 interf
R2#config t
R2 (config) # interface fa0/0
R2 (config-if) # ip address 8.1.1.2255.255.255.0
R2 (config-if) # no shut
R2 (config-if) # exit
R2 (config) # interface fa1/0
R2 (config-if) # ip address 9.1.1.2255.255.255.0
R2 (config-if) # no shut
R2 (config-if) # exit
R2 (config) # ip routing
R2 (config) # exit
R2#
R3#config t
R3 (config) # interface fa0/0
R3 (config-if) # ip address 9.1.1.1255.255.255.0
R3 (config-if) # no shut
R3 (config-if) # exit
R3 (config) # interface loopback 0
R3 (config-if) # ipv6 enable
R3 (config-if) # ipv6 address 2002 Groupe 1DUP 96
R3 (config-if) # no shut
R3 (config-if) # exit
R3 (config) # interface tunnel 0
R3 (config-if) # ipv6 enable
R3 (config-if) # tunnel mode ipv6ip auto
R3 (config-if) # tunnel source fa0/0
R3 (config-if) # no shut
R3 (config-if) # exit
R3 (config) # ip routing
R3 (config) # iproute 8.1.1.0 255.255.255.0 9.1.1.2
R3 (config) # ipv6 unicast-routing
R3 (config) # ipv6 route 2001 Glox Glop 96:: 8.1.1.1
R3 (config) # ^ Z
R3#
