Configuring a tunnel between 2 Cisco 2811 routers, done in Cisco Packet Tracer.
Partial config of RouterA
RouterA#show running-config ! ! interface Tunnel0 ip address 192.168.10.1 255.255.255.0 mtu 1476 tunnel source Serial1/0 tunnel destination 63.1.1.2 ! ! interface FastEthernet0/0 ip address 10.0.10.1 255.255.255.0 duplex auto speed auto ! interface Serial1/0 ip address 63.1.1.1 255.255.255.252 clock rate 2000000 ! ip route 0.0.0.0 0.0.0.0 192.168.10.2
Partial config of RouterB
RouterB#show running-config ! interface Tunnel0 ip address 192.168.10.2 255.255.255.0 mtu 1476 tunnel source Serial1/0 tunnel destination 63.1.1.1 ! ! interface FastEthernet0/0 ip address 10.0.20.1 255.255.255.0 duplex auto speed auto ! interface Serial1/0 ip address 63.1.1.2 255.255.255.252 ! ip route 0.0.0.0 0.0.0.0 192.168.10.1 !
Show ip route (RouterA)
RouterA#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 192.168.10.2 to network 0.0.0.0
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.10.0 is directly connected, FastEthernet0/0
63.0.0.0/30 is subnetted, 1 subnets
C 63.1.1.0 is directly connected, Serial1/0
C 192.168.10.0/24 is directly connected, Tunnel0
S* 0.0.0.0/0 [1/0] via 192.168.10.2
Show ip route (RouterB)
RouterB#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 192.168.10.1 to network 0.0.0.0
10.0.0.0/24 is subnetted, 1 subnets
C 10.0.20.0 is directly connected, FastEthernet0/0
63.0.0.0/30 is subnetted, 1 subnets
C 63.1.1.0 is directly connected, Serial1/0
C 192.168.10.0/24 is directly connected, Tunnel0
S* 0.0.0.0/0 [1/0] via 192.168.10.1
Ping check: RouterA can ping RouterB on 10.0.20.1
RouterA#ping 10.0.20.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.0.20.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms