R1
interface Tunnel1
ip address 192.168.0.1 255.255.255.252
tunnel source FastEthernet0/0
tunnel destination 10.0.34.4 <-- Ip pública Destino
!
interface FastEthernet0/0
ip address 10.0.12.1 255.255.255.0 <-- Ip pública Origen
!
R4
interface Tunnel1
ip address 192.168.0.2 255.255.255.252
tunnel source FastEthernet0/0
tunnel destination 10.0.12.1 <-- Ip pública Destino
!
interface FastEthernet0/0
ip address 10.0.34.4 255.255.255.0 <-- Ip pública Origen
!