Cisco CCNA GRE Tunnel Configuration

Posted filed under Cisco CCNA.

 

Now I will do small Lab:The Goal is that PC1 (private Network) be able to Ping PC2 another Private Network, by going Via R3 which represent internet. R3 has no connectivity to LAN 192.168.2.0 and 192.168.1.0 /24
Here is R1 has default route to ISP (R3):

R1#show ip route
Codes: C – connected, S – static, I – IGRP, R – RIP, M – mobile, B – BGPD – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter areaN1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2E1 – OSPF external type 1, E2 – OSPF external type 2, E – EGPi – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, ia – IS-IS inter area

* – candidate default, U – per-user static route, o – ODR

P – periodic downloaded static route

Gateway of last resort is 20.20.20.2 to network 0.0.0.0

20.0.0.0/30 is subnetted, 1 subnets

C 20.20.20.0 is directly connected, Serial0/0/0

C 192.168.1.0/24 is directly connected, FastEthernet0/0

S* 0.0.0.0/0 [1/0] via 20.20.20.2

R1#

 

Also R2 has a default route to ISP (R3):

R2#show ip route

Codes: C – connected, S – static, I – IGRP, R – RIP, M – mobile, B – BGP

D – EIGRP, EX – EIGRP external, O – OSPF, IA – OSPF inter area

N1 – OSPF NSSA external type 1, N2 – OSPF NSSA external type 2

E1 – OSPF external type 1, E2 – OSPF external type 2, E – EGP

i – IS-IS, L1 – IS-IS level-1, L2 – IS-IS level-2, ia – IS-IS inter area

* – candidate default, U – per-user static route, o – ODR

P – periodic downloaded static route

 

Gateway of last resort is 30.30.30.1 to network 0.0.0.0

 

30.0.0.0/30 is subnetted, 1 subnets

C 30.30.30.0 is directly connected, Serial0/0/0

C 192.168.2.0/24 is directly connected, FastEthernet0/0

S* 0.0.0.0/0 [1/0] via 30.30.30.1

 

So right now I should be able to ping from R1 to Public IP address of R2 ( Think of R1 for Company 1) and think of R2 for Company 2

 

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