Packet Tracer – Troubleshooting GRE (Instructor Version)
Instructor Note: Red font color or gray highlights indicate text that appears in the instructor copy only.
Topology
Addressing Table
Objectives
Find and Correct All Network Errors
Verify Connectivity
Scenario
A junior network administrator was hired to set up a GRE tunnel between two sites and was unable to complete the task. You have been asked to correct configuration errors in the company network.
Part 1: Find and Correct All Network Errors.
Part 2: Verify Connectivity
Step 1: Ping PCA from PCB.
Attempt to ping the IP address of PCA from PCB. The ping should be successful.
Step 2: Trace the path from PCA to PCB.
Attempt to trace the path from PCA to PCB. Note the lack of public IP addresses in the output.
Device Configs
Router RA no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption hostname RA interface Tunnel0 ip address 192.168.1.1 255.255.255.252 tunnel source Serial0/0/0 tunnel destination 64.103.211.2 tunnel mode gre ip interface GigabitEthernet0/0 ip address 172.31.0.1 255.255.255.0 duplex auto speed auto interface GigabitEthernet0/1 no ip address duplex auto speed auto shutdown interface GigabitEthernet0/2 no ip address duplex auto speed auto shutdown interface Serial0/0/0 ip address 209.165.122.2 255.255.255.252 interface Serial0/0/1 no ip address shutdown interface Vlan1 no ip address shutdown ip classless ip route 0.0.0.0 0.0.0.0 Serial0/0/0 ip route 172.31.1.0 255.255.255.0 192.168.1.2 line con 0 line aux 0 line vty 0 4 login end
Router RB
no service timestamps log datetime msec no service timestamps debug datetime msec no service password-encryption hostname RB interface Tunnel0 ip address 192.168.1.2 255.255.255.252 tunnel source Serial0/0/0 tunnel destination 209.165.122.2 tunnel mode gre ip interface GigabitEthernet0/0 ip address 172.31.1.1 255.255.255.0 duplex auto speed auto interface GigabitEthernet0/1 no ip address duplex auto speed auto shutdown interface GigabitEthernet0/2 no ip address duplex auto speed auto shutdown interface Serial0/0/0 ip address 64.103.211.2 255.255.255.252 interface Serial0/0/1 no ip address shutdown interface Vlan1 no ip address shutdown ip classless ip route 0.0.0.0 0.0.0.0 Serial0/0/0 ip route 172.31.0.0 255.255.255.0 192.168.1.1 line con 0 line aux 0 line vty 0 4 login end
