Lab. 13 GRE Tunnel
Generic Routing Encapsulation adalah protokol tunneling yang dikembangkan oleh Cisco Systems yang dapat merangkum berbagai protokol lapisan jaringan di dalam virtual point-to-point link atau point-to-multipoint link melalui jaringan Internet Protocol
Konfigurasi Dasar :
R1
R1(config)#interface f0/0
R1(config-if)#ip address 12.12.12.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface f0/1
R1(config-if)#ip address 13.13.13.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface lo0
R1(config-if)#ip add 8.8.8.8 255.255.255.255
R1(config-if)#exit
R2
R2(config)#interface f0/0
R2(config-if)#ip address 12.12.12.2 255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.255
R2(config-if)#exit
R3
R3(config)#interface f0/0
R3(config-if)#ip add 13.13.13.3 255.255.255.0
R3(config-if)#no shutdown
R3(config-if)#exit
R3(config)#interface lo0
R3(config-if)#ip add 3.3.3.3 255.255.255.255
R3(config-if)#exit
Masukan Default route di R2 dan R3
R2 dan R3
R2(config)#ip route 0.0.0.0 0.0.0.0 12.12.12.1
R3(config)#ip route 0.0.0.0 0.0.0.0 13.13.13.1
Kita verifikasi
R2 dan R3
R2(config)#do ping 8.8.8.8 Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/28/64 ms
R3(config)#do ping 3.3.3.3
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
R2
R2(config)#interface tunnel23
R2(config-if)#tunnel source f0/0
R2(config-if)#tunnel destination 13.13.13.3
R2(config-if)#ip address 172.16.10.1 255.255.255.252
R2(config-if)#exit
R3
R3(config)#interface tunnel23
R3(config-if)#tunnel source f0/0
R3(config-if)#tunnel destination 12.12.12.2
R3(config-if)#ip address 172.16.10.2 255.255.255.252
R3(config-if)#exit
Kita lakukan verifikasi pada R2 dan pastikan sudah “up” dan kita lakukan
ping.
R2
R2(config)#do show int tunnel 23 | i protocol
Tunnel23 is up, line protocol is up
Tunnel protocol/transport GRE/IP
0 unknown protocol drops
R2(config)#do ping 172.16.10.2
Sending 5, 100-byte ICMP Echos to 172.16.10.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/38/116 ms
R2
R2(config)#router eigrp 23
R2(config-router)#network 172.16.10.1 0.0.0.0
R2(config-router)#network 2.2.2.2 0.0.0.0
R2(config-router)#no auto-summary
R2(config-router)#exit
R3
R3(config)#router eigrp 23
R3(config-router)#network 3.3.3.3 0.0.0.0
R3(config-router)#network 172.16.10.2 0.0.0.0
R3(config-router)#no auto-summary
Verifikasi pada R2 dan R3
R2
R2(config)#do show ip route eigrp
3.0.0.0/32 is subnetted, 1 subnets
D…………3.3.3.3 [90/27008000] via 172.16.10.2, 00:00:32, Tunnel23
R3
R3(config)#do show ip route eigrp
2.0.0.0/32 is subnetted, 1 subnets
D……….2.2.2.2 [90/27008000] via 172.16.10.1, 00:01:46, Tunnel32
Kita cek ping
R2
R2(config)#do ping 3.3.3.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/31/44 ms
R3
R3(config)#do ping 2.2.2.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 24/35/52 ms
Maka jika kita traceroute maka traffic nya akan diarahkan via interface tunnel
R2
R2#traceroute 3.3.3.3 source 2.2.2.2
Type escape sequence to abort. Tracing the route to 3.3.3.3
1 172.16.10.2 52 msec 20 msec 36 msec
