Configured Tunnels

A tunnel is created between Cisco routers by creating tunnel interfaces in the routers that border the IPv6 and IPv4 networks The tunnel s endpoints are defined in both routers An IPv6 subnet is created for the tunnel and both routers are assigned IPv6 addresses If an IPv6 dynamic routing protocol is in use such as RIPng or BGP the protocol is enabled on the tunnel interface Figure 8 26 shows two IPv6 networks connected to an IPv4 network A tunnel is configured between the IPv6 networks to enable communication

Figure 8 26 Network Diagram of IPv6 Networks Tunneled Over an IPv4 Network

Tulip and Lily are IPv6 only routers They communicate with each other via the IPv6 over IPv4 tunnel between Daisy and Rose

Example 8 10 shows the configurations of Daisy and Rose

Example 8 10 Configured Tunnel Router Configurations

Daisy ipv6 unicast routing i interface TunnelO description tunnel Daisy Rose no ip address no ip directed broadcast ipv6 address FEC0::A:0:0 0:1/124 ipv6 rip flowerpot enable tunnel source Seriall 503 tunnel destination 172 69 255 250 tunnel mode ipv6ip

interface Ethernet© ipv6 address FEC0: : 1:0:0:0:0/64 eui 64 ipv6 rip flowerpot enable

interface Seriall 503 point to point ip address 172 69 255 254 255 255 255 252

Rose ipv6 unicast routing

Figure 8 26 Network Diagram of IPv6 Networks Tunneled Over an IPv4 Network

Example 8-10 Configured Tunnel Router Configurations (Continued)

interface TunnelO description tunnel Rose -> Daisy no îp address no îp directed-broadcast ipv6 address FEC0::A:0:0:0:2/124 ipv6 rip flowerpot enable tunnel source Seriall 703 tunnel destination 172.69.255.254 tunnel mode ipv6ip interface Ethernetl no îp address ipv6 address FEC0: .-2:0:0:0:0/64 eui-64 ipv6 rip flowerpot enable interface Seriall 703 point to-point îp address 172.69.255.250 255.255.255.252

The tunnel interface is a generic tunnel, configured with ipv6ip mode.

The traceroute from Tulip to Lily in Example 8-11 shows the IPv6 packet traversing the tunnel.

Example 8-11 Displaying the IPv6 Packet Traversing the Tunnel from Tulip to Lily

Tulip#traceroute ipv6 fec0:0:0:2:210:7bff"fe3a:ce8a

Type escape sequence to abort.

Tracing the route to FEC0::2:210:7BFF.FE3A:CE8A

1 FEC0: 1:200-CFF:FE0A:2AA9 8 msec 4 msec

3 FEC0::2:210*7BFF:FE3A:CE8A 28 msec 20 msec

The first address is Daisy's IPv6 Ethernet address. The second address is Rose s tunnel interface address. The third address is Lily's Ethernet address.

Configured tunnels offer a straightforward way to connect two IPv6 networks over an IPv4 network.

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