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