Simple vpn-small case of GRE Principle

650) this. width = 650; "src =" http://www.bkjia.com/uploads/allimg/131227/060552O24-0.png "title =" simple vpn .png "/>

The IP address range 192.168.1.0 can be pinged to the IP address range 192.168.2.0.

R1:

Conf ter

Int f1/0

Ip add 12.1.1.1255.255.255.0

No shu

Exit

Int loo 0

Ip add 192.168.1.1255.255.255.0

No shu

Exit

Int tunnel1 // create a tunnel Port

Tunnel source 12.1.1.1 // set the tunnel source Address

Tunnel des 23.1.1.2 // set the destination tunnel address

Ip add 10.1.1.1 255.255.255.0 // set the tunnel ip Address

No shu

Exit

Ip route192.168.2.0 255.255.255.0 tunnel 1 // set a static route

Ip route 0.0.0.0 0.0.0.0 f1/0 // sets the default route for mutual access between the Internet

R2:

Conf ter

Int f1/0

Ip add 12.1.1.22.16255.255.0

No shu

Int f1/1

Ip add 23.1.1.1255.20.255.0

No shu

Exit

R3:

Conf ter

Int f1/0

Ip add 23.1.1.22.16255.255.0

No shu

Int loo 0

Ip add 192.168.2.1255.255.255.0

No shu

Exit

Int tunnel3

Tunnel source 23.1.1.2

Tunnel des 12.1.1.1

Ip add11.1.1.1 255.255.255.0

No shu

Exit

Ip route192.168.1.0 255.255.255.0 tunnel 3

Ip route 0.0.0.0 0.0.0.0 f1/0

Exit

R1 # ping 192.168.2.1source 192.168.1.1

Type escape sequenceto abort.

Sending 5, 100-byteICMP Echos to 192.168.2.1, timeout is 2 seconds:

Packet sent with asource address of 192.168.1.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 324/420/584 MS

R3 # ping 192.168.1.1source 192.168.2.1

Type escape sequenceto abort.

Sending 5, 100-byteICMP Echos to 192.168.1.1, timeout is 2 seconds:

Packet sent with asource address of 192.168.2.1

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 324/448/636 MS