WB1 9.29 IPv6 Tunneling

9.29 IPv6 Tunneling

• Create new Loopback interfaces on R2, R5, and R6 with the IP addresses
2001:X:0:Y::Y/64 where Y is the router number and X is your rack number
in decimal notation (e.g. 10 for rack 10, 11 for rack 11 etc.)
• Create tunnels between R5 & R6 and R2 & R6. Use the IPv6 addresses
2001:X:0:56::Y/64 for the tunnel between R5 and R6 and the IPv6 address
2001:X:0:26::Y/64 for the tunnel between R2 and R6.
• The tunnel connecting R2 and R6 should use encapsulation suitable for
transporting different Layer 3 protocols.
• The tunnel connecting R5 and R6 should use the encapsulation
specifically designed for transporting IPv6 over IPv4.
• Use static routing to obtain connectivity.

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R2:
ipv6 unicast-routing
!
interface Loopback100
ipv6 address 2001:1:0:2::2/64
!
interface tunnel 26
tunnel source Loopback0
tunnel destination 150.1.6.6
ipv6 address 2001:1:0:26::2/64
!
ipv6 route ::/0 Tunnel 26

R5:
ipv6 unicast-routing
!
interface Loopback100
ipv6 address 2001:1:0:5::5/64
!
interface tunnel 56
tunnel source Loopback0
tunnel destination 150.1.6.6
ipv6 address 2001:1:0:56::5/64
tunnel mode ipv6ip
!
ipv6 route ::/0 Tunnel 56

R6:
ipv6 unicast-routing
!
interface Loopback100
ipv6 address 2001:1:0:6::6/64
!
interface tunnel 26
tunnel source Loopback0
tunnel destination 150.1.2.2
ipv6 address 2001:1:0:26::6/64
!
interface tunnel 56
tunnel source Loopback0
tunnel destination 150.1.5.5
ipv6 address 2001:1:0:56::6/64
tunnel mode ipv6ip
!
ipv6 route 2001:1:0:5::/64 Tunnel 56
ipv6 route 2001:1:0:2::/64 Tunnel 26

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IPv6 can be transported across IPv4 clouds using various tunneling techniques.
The most common are static point-to-point tunnels, using either GRE (generic
routing encapsulation), or IPv6 in IPv4 encapsulation (a special protocol type
designed to carry only IPv6 packets). Designed to carry a multi-protocol payload,
GRE has a slightly larger overhead than IPv6 in IPv4 encapsulation.

-------------

Rack1R6#show interfaces tunnel 26
Rack1R6#show interfaces tunnel 56
Rack1R2#ping 2001:1:0:5::5 source loopback 100

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IPv6 IP tunnels use IP protocol number 41 for transport. This protocol number
does not have a keyword shortcut in extended IP access-lists in IOS. Therefore
to permit or deny an IPv6IP tunnel, the syntax access-list 100
[permit|deny] 41 any any is required.