6.3.7 Packet Tracer – Configure OSPF Authentication Answers

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6.3.7 Packet Tracer – Configure OSPF Authentication Answers

Packet Tracer – Configure OSPF Authentication (Answers Version)

Answers Note: Red font color or gray highlights indicate text that appears in the instructor copy only.

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

R1

G0/0/1

192.168.1.1

255.255.255.0

N/A

S1 F0/5

R2

G0/0/0

10.1.1.2

255.255.255.252

N/A

N/A

R2

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

R3

G0/0/1

192.168.3.1

255.255.255.0

N/A

S3 F0/5

PC-A

NIC

192.168.1.5

255.255.255.0

192.168.1.1

S1 F0/6

PC-B

NIC

192.168.1.6

255.255.255.0

192.168.1.1

S2 F0/18

PC-C

NIC

192.168.3.5

255.255.255.0

192.168.3.1

S3 F0/18

Blank Line, No additional information

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.

  1. Verify the MD5 authentication configurations using the commands show ip ospf interface.
  2. Verify end-to-end connectivity.

Answer Scripts

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