Introduction:

• R1, R2, R3, R4 are running RIPv2
• We would like to form a IPv6 Tunnel between R1 and R2 over the IPv4 network (RIP)
• For this scenario, we will form a ISATAP Tunnel

Configuration Checklist:

• Configure R1-R3 interface with network 10.0.1.0/24
• Configure R3-R2 interface with network 10.0.2.0/24
• Configure R3-R4 interface with network 10.0.4.0/24
• Configure RIP to run between R1, R2, R3, R4

Configure IPv4 Networking:

R1:

interface Ethernet0/0
 ip address 10.0.1.1 255.255.255.0
end
!
router rip
 version 2
 network 10.0.0.0
 no auto-summary
!

R2:

!
interface Ethernet0/1
 ip address 10.0.2.1 255.255.255.0
end
!
router rip
 version 2
 network 10.0.0.0
 no auto-summary
!

R3:

!
interface Ethernet0/0
 ip address 10.0.1.2 255.255.255.0
end
!
interface Ethernet0/1
 ip address 10.0.2.2 255.255.255.0
end
!
interface Ethernet0/2
 ip address 10.0.3.2 255.255.255.0
end
!
router rip
 version 2
 network 10.0.0.0
 no auto-summary

R4:

interface Ethernet0/2
 ip address 10.0.3.1 255.255.255.0
end
!
router rip
 version 2
 network 10.0.0.0
 no auto-summary

Checking RIP Routes and Connectivity:

Router R1 – R2:

R1#sh ip route rip | begin Gate
Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
R 10.0.2.0/24 [120/1] via 10.0.1.2, 00:00:14, Ethernet0/0
R 10.0.3.0/24 [120/1] via 10.0.1.2, 00:00:14, Ethernet0/0
R1#
R1#
R1#ping 10.0.2.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/1 ms
R1#

Configure Tunnel-0:

Router R1:

interface Tunnel0
 no ip address
 no ip redirects
 ipv6 address 2005:0:0:7::/64 eui-64
 ipv6 enable
 tunnel source 10.0.1.1
 tunnel mode ipv6ip isatap
end
!

R1#sh ipv6 interface brief | begin Tunnel0
 Tunnel0 [up/up]
 FE80::5EFE:A00:101
 2005::7:0:5EFE:A00:101

Router R2:

interface Tunnel0
 no ip address
 ipv6 address autoconfig
 ipv6 enable
 tunnel source 10.0.2.1
 tunnel mode ipv6ip
 tunnel destination 10.0.1.1
 end 
!

R2#sh ipv6 interface brief | begin Tunnel0
 Tunnel0 [up/up]
 FE80::A00:201
 2005::7:0:0:A00:201

Check Ipv6 Connectivity: