Creating an IPv6 in IPv4 tunnel for traversing a public network

This example creates an IPv6 in IPv4 tunnel between two switches, enabling traffic from two networks to traverse a public network.

Procedure

1. On switch 1:
   1. Enable interface 1/1/1 and assign the IP address 10.1.1.1/24 to it.

      switch# config

      switch(config)# interface 1/1/1

      switch(config-if)# ip address 10.1.1.1/24

      switch(config-if)# no shutdown

   2. Enable interface 1/1/2 and assign the IP address 2080::2/64 to it.

      switch# config

      switch(config)# interface 1/1/2

      switch(config-if)# ipv6 address 2080::2/64

      switch(config-if)# no shutdown

      switch(config-if)# exit

   3. Create IPv6 in IPv4 tunnel 10 and assign the IP address 2001:DB8::1/32, source address 10.1.1.1, and destination address 20.1.1.1 to it.

      switch(config)# interface tunnel 10 mode ip 6in4

      switch(config-ip-if)# ipv6 address 2001:DB8::1/62

      switch(config-ip-if)# source ip 10.1.1.1

      switch(config-ip-if)# destination ip 20.1.1.1

      switch(config-ip-if)# no shutdown

      switch(config-ip-if)# exit

   4. Defines routes so that traffic from network 1 can reach network 2 through the tunnel.

      switch(config)# ip route 20.1.1.0/24 10.1.1.2 switch(config)# ipv6 route 290::0/64 tunnel10

2. On switch 2:
   1. Enable interface 1/1/1 and assign the IP address 20.1.1.1/24 to it.

      switch# config

      switch(config)# interface 1/1/1

      switch(config-if)# ip address 20.1.1.1/24

      switch(config-if)# no shutdown

   2. Enable interface 1/1/2 and assign the IP address 2090::2/64 to it.

      switch(config)# interface 1/1/2

      switch(config-if)# ipv6 address 2090::2/64

      switch(config-if)# no shutdown

      switch(config-if)# exit

   3. Create IPv6 in IPv4 tunnel 10 and assign the IP address 2001:DB8::2/32, source address 10.1.1.1, and destination address 20.1.1.1 to it.

      switch(config)# interface tunnel 10 mode ip 6in4

      switch(config-ip-if)# ipv6 address 2001:DB8::2/62

      switch(config-ip-if)# source ip 20.1.1.1

      switch(config-ip-if)# destination ip 10.1.1.1

      switch(config-ip-if)# no shutdown

      switch(config-ip-if)# exit

   4. Defines routes so that traffic from network 2 can reach network 1 through the tunnel.

      switch(config)# ip route 10.1.1.0/24 20.1.1.2

      switch(config)# ip route 2080::0/64 tunnel10