https://blog.csdn.net/chiyuwei1766/article/details/48211023
实验目录：
1）在IPV4中穿越IPV6。
2）有IPV6中穿越IPV4。
实验配置：
1）各接口IP配置如上，且在R5、R2、R3、R4的ipv6接口上都配置有ripng路由协议（注意关闭水平分割）。R2、R3都有指向公网的默认路由。
1.1、实验拓扑：
1.2、在IPv4中穿越ipv6，建立隧道如下
R2#sh run
interface Tunnel2
no ip address
ipv6 address 21::1/64 \tunnel隧道接口IP类型为ipv6，表明隧道所封装的原始IP数据流为ipv6。
ipv6 rip ripng_1 enable
tunnel source 1.1.1.2
tunnel destination 2.2.2.2
R3#sh run
interface Tunnel3
no ip address
ipv6 address 31::1/64
ipv6 rip ripng_1 enable
tunnel source 2.2.2.2
tunnel destination 1.1.1.2
1.3、查看路由表及测试连通性
R2(config-if)#do sh ipv rou
IPv6 Routing Table – 9 entries
Codes: C – Connected, L – Local, S – Static, R – RIP, B – BGP
U – Per-user Static route, M – MIPv6
I1 – ISIS L1, I2 – ISIS L2, IA – ISIS interarea, IS – ISIS summary
O – OSPF intra, OI – OSPF inter, OE1 – OSPF ext 1, OE2 – OSPF ext 2
ON1 – OSPF NSSA ext 1, ON2 – OSPF NSSA ext 2
D – EIGRP, EX – EIGRP external
C 20::/64 [0/0]
via ::, Serial1/3
L 20::1/128 [0/0]
via ::, Serial1/3
C 21::/64 [0/0]
via ::, Tunnel2
L 21::1/128 [0/0]
via ::, Tunnel2
R 30::/64 [120/2]
via FE80::C602:22FF:FE9C:0, Tunnel2 \路由表中出现R3的tunnel接口路由，说明隧道已通。
R 31::/64 [120/2]
via FE80::C602:22FF:FE9C:0, Tunnel2
R 40::/64 [120/3]
via FE80::C602:22FF:FE9C:0, Tunnel2
R 50::/64 [120/2]
via FE80::CA04:2BFF:FEC0:0, Serial1/3
L FF00::/8 [0/0]
via ::, Null0
R2(config-if)#
R2(config-if)# do ping 40::1 sou 20::1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 40::1, timeout is 2 seconds:
Packet sent with a source address of 20::1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 48/63/80 ms
R2(config-if)#
表明隧道建立成功。IPV6成功穿越IPV4。
2）在IPV6中穿越IPV4。由上面的配置结果知道，在R5与R4之间已经实现IPV6的通讯，所以下面的实验是在R5与R4通讯的IPV6中穿越IPV4。
2.1、实验拓扑：
2.2、在1）最后配置的基础上再添加如上配置。
R5#sh run
interface Tunnel5
ip address 10.10.10.1 255.255.255.252
tunnel source 50::1
tunnel destination 40::1
tunnel mode gre ipv6 \必须将tunnel模式设置为gre ipv6，因为tunnle隧道的source、destination地址为ipv6。
!
R4(config-if)# do sh run
interface Tunnel4
ip address 10.10.10.2 255.255.255.252
tunnel source 40::1
tunnel destination 50::1
tunnel mode gre ipv6
测试隧道建立情况
R5(config)#do ping 10.10.10.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 68/108/184 ms
R5(config)#
表明隧道建立成功，IPV4数据流可以穿越IPV6。
