interface Tunnel0
ip address 192.168.3.1 255.255.255.0
tunnel source 192.168.1.1
tunnel destination 192.168.2.2
R3:\\
interface Tunnel0
ip address 192.168.3.2 255.255.255.0
tunnel source 192.168.2.2
tunnel destination 192.168.1.1
====== GNS3 ======