1. Make sure you have at least IOS version 12.2 T we'll start by loggin in into the router and go into previllage or enable mode

2. configure terminal

3. ipv6 unicast-routing

4. interface Tunnel0

5. description Tunnel to Your_Tunnel_Broker

6. no ip address

7. ipv6 address [your_ipv6_public]/127

8. ipv6 enable

9. ipv6 mtu 1280

10. tunnel source [your_ipv4_public]

11. tunnel destination [ipv4_of_tunnel_broker]

12. tunnel mode ipv6ip

13. interface Ethernet0/0

14. description LAN

15. ! ipv4 LAN Segment

16. ip address 192.168.1.2 255.255.255.0

17. ip nat inside

18. ip tcp adjust-mss 1412

19. ipv6 address [ipv6_ip]/64

20. ipv6 mtu 1280

21. ipv6 address [ipv6_subnet_prefix_whichever_sounds_better]/64

22. ipv6 enable

23. ipv6 nd ra-interval 60

24. ipv6 nd ra-lifetime 180

25. ipv6 nd prefix-advertisement [youre_segment_ipv6]::/64 360 60 autoconfig

26. no cdp enable

27. ipv6 route [youre_segment_ipv6]::/64 Ethernet0

28. ! nullrouting

29. ipv6 route [a_segment_ipv6]::/48 Null0

30. ipv6 route ::/0 Tunnel0

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COMMANDS SHOULD LOOK SOMETHING LIKE THIS BELOW

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configure terminal

ipv6 unicast-routing

interface Tunnel0

description Tunnel to BT Exact

no ip address

ipv6 address 2001:618:400::45A9:3262/128

ipv6 enable

ipv6 mtu 1280

tunnel source 69.169.48.2

tunnel destination 213.121.24.85

tunnel mode ipv6ip

interface Ethernet0/0

description LAN

! ipv4 LAN Segment

ip address 192.168.1.2 255.255.255.0

ip nat inside

ip tcp adjust-mss 1412

ipv6 address [2001:618:400:bd9f::200/64

ipv6 mtu 1280

ipv6 address 2001:618:400:bd9f::200/64

ipv6 enable

ipv6 nd ra-interval 60

ipv6 nd ra-lifetime 180

ipv6 nd prefix-advertisement 2001:618:400:bd9f::/64 360 60 autoconfig

no cdp enable

ipv6 route 2001:618:400:bd9f::/64 Ethernet0

! nullrouting

ipv6 route 2001:618:400:BD9F:206:28FF:FE31:4860/48 Null0

ipv6 route ::/0 Tunnel0