GRE tunnels

GRE stands for Generic Routing Encapsulation
it is:
– an Industry Standard created by Cisco
– Used to create a ‘Tunnel’ Interface
– Not Secure
– designed to work with ‘logical protocols’
-can be used with IPSEC

. | IP | GRE | IP | TCP | DATA |

how to create a GRE Tunnel

R1(config)#int tunnel 0
R1(config-if)#ip address 192.168.9.1 255.255.255.0
R1(config-if)#tunnel source ser 1/1
R1(config-if)#tunnel dest 192.168.9.2
R1(config-if)#tunnel mode gre ip

R2(config)#int tunnel 0
R2(config-if)#ip address 192.168.9.2 255.255.255.0
R2(config-if)#tunnel source ser 1/1
R2(config-if)#tunnel dest 192.168.9.1
R2(config-if)#tunnel mode gre ip

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