R1:

ipv6 unicast-routing
!        
interface FastEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address 12::1/64
!
ipv6 route ::/0 12::2

 

R2:
 

ipv6 unicast-routing
!        
interface Loopback0
ip address 10.1.1.2 255.255.255.255
!        
interface Tunnel0
no ip address
no ip redirects
 ipv6 address 2002:CA01:101::/128        //第一个16位使用6to4隧道保留IP地址2002::/16,第二和三个16位使用的是tunnel souce地址202.1.1.1转换成十六进制
tunnel source FastEthernet1/0
tunnel mode ipv6ip 6to4
!
interface FastEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address 12::2/64
!
interface FastEthernet1/0
ip address 202.1.1.1 255.255.255.0
duplex auto
speed auto
!
ip route 0.0.0.0 0.0.0.0 202.1.1.254
!
ipv6 route 45::/64 Tunnel0 2002:4001:101::   //路由器发现目标IP地址为45::/64查找下一跳2002:4001:101::  
ipv6 route 2002::/16 Tunnel0        //路由器发现2002::/16的下一跳为tunnel0接口，到达tunnel接口，因为是6to4隧道，隧道自动把第二和三个16位转换成IPv4地址封装进一个IPv4包头发送出去

 

R3:

interface FastEthernet0/0
ip address 202.1.1.254 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/0
ip address 64.1.1.254 255.255.255.0
duplex auto
speed auto

 

R4:

ipv6 unicast-routing
!        
interface Loopback0
ip address 10.1.1.4 255.255.255.255
!        
interface Tunnel0
no ip address
no ip redirects
ipv6 address 2002:4001:101::/128
tunnel source FastEthernet0/0
tunnel mode ipv6ip 6to4
!
interface FastEthernet0/0
ip address 64.1.1.1 255.255.255.0
duplex auto
speed auto
!
interface FastEthernet1/0
no ip address
duplex auto
speed auto
ipv6 address 45::4/64
!

ip route 0.0.0.0 0.0.0.0 64.1.1.254
!
ipv6 route 12::/64 Tunnel0 2002:CA01:101::
ipv6 route 2002::/16 Tunnel0

 

R5:

ipv6 unicast-routing
!        
interface FastEthernet0/0
no ip address
duplex auto
speed auto
ipv6 address 45::5/64
!
ipv6 route ::/0 45::4

 

R1PING通R5

经过tunnel口