6.3.7 Packet Tracer – Configure OSPF Authentication (Answeers Version)
Tolology:
6.3.7 Packet Tracer – Configure OSPF Authentication
Addressing Table
| Device | Interface | IP Address | Subnet Mask | Default Gateway | Switch Port |
|---|---|---|---|---|---|
| R1 | G0/0/0 | 10.1.1.1 | 255.255.255.252 | N/A | N/A |
| G0/0/1 | 192.168.1.1 | 255.255.255.0 | N/A | S1F0/5 | |
| R2 | G0/0/0 | 10.1.1.2 | 255.255.255.252 | N/A | N/A |
| G0/0/1 | 10.2.2.2 | 255.255.255.252 | N/A | N/A | |
| R3 | G0/0/0 | 10.2.2.1 | 255.255.255.252 | N/A | N/A |
| G0/0/1 | 192.168.3.1 | 255.255.255.0 | N/A | S3F0/5 | |
| PC-A | NIC | 192.168.1.5 | 255.255.255.0 | 192.168.1.1 | S1F0/6 |
| PC-B | NIC | 192.168.1.6 | 255.255.255.0 | 192.168.1.1 | S2F0/18 |
| PC-C | NIC | 192.168.3.5 | 255.255.255.0 | 192.168.3.1 | S3F0/18 |
Objectives
– Configure OSPF MD5 authentication.
Background / Scenario
In this activity, you will configure OSPF MD5 authentication for secure routing updates.
Instructions
Part 1: Configure OSPF MD5 Authentication
Step 1: Test connectivity. All devices should be able to ping all other IP addresses.
Step 2: Configure OSPF MD5 authentication for all the routers in area 0.
Configure OSPF MD5 authentication for all the routers in area 0.
R1(config)# router ospf 1 R1(config-router)# area 0 authentication message-digest
R2(config)# router ospf 1 R2(config-router)# area 0 authentication message-digest
R3(config)# router ospf 1 R3(config-router)# area 0 authentication message-digest
Step 3: Configure the MD5 key for all the routers in area 0.
Configure an MD5 key on the GigabitEthernet interfaces on R1, R2 and R3. Use the password MD5pa55 for key 1.
R1(config)# interface g0/0/0 R1(config-if)# ip ospf message-digest-key 1 md5 MD5pa55
R2(config)# interface g0/0/0 R2(config-if)# ip ospf message-digest-key 1 md5 MD5pa55 R2(config-if)# interface g0/0/1 R2(config-if)# ip ospf message-digest-key 1 md5 MD5pa55
R3(config)# interface g0/0/1 R3(config-if)# ip ospf message-digest-key 1 md5 MD5pa55
Step 4: Verify configurations.
a. Verify the MD5 authentication configurations using the commands show ip ospf interface.
b. Verify end-to-end connectivity.
Answers Script
Router R1
conf t interface g0/0/0 ip ospf message-digest-key 1 md5 MD5pa55 router ospf 1 area 0 authentication message-digest end
Router R2
conf t interface g0/0/0 ip ospf message-digest-key 1 md5 MD5pa55 interface g0/0/1 ip ospf message-digest-key 1 md5 MD5pa55 router ospf 1 area 0 authentication message-digest end
Router R3
conf t interface g0/0/0 ip ospf message-digest-key 1 md5 MD5pa55 router ospf 1 area 0 authentication message-digest end
