In this tutorial we are going to learn how to configure OSPF MD5 Authentication in cisco packet tracer.

OSPF MD5 Authentication is very semilar to the cler text authentication

Note :- While configuring the OSPF MD 5 authentication you must keep these 2 things in mind which are given blow

• You need to configure the md5 value on an interface by using IP OSPF message-digest-key 1 md5 value interface command
• You need to configure the interface to use MD5 authentication by using the IP OSPF authentication message-digest interface command

Firstly assign the ip address to the router and pc and

configuration on R1:

Router>enable

Router#config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#int f0/0

Router(config-if)#ip add 1.0.0.1 255.0.0.0

Router(config-if)#no shut

Router(config-if)#

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

Router(config-if)#exit

Router(config)#int f0/1

Router(config-if)#ip add 2.0.0.1 255.0.0.0

Router(config-if)#no shut

Router(config-if)#

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

Router(config-if)#exit

Router(config)#

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

configuration on R2:

Router>

Router>en

Router#config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#int f0/0

Router(config-if)#ip add 2.0.0.2 255.0.0.0

Router(config-if)#no shut

Router(config-if)#

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up

exit

Router(config)#int f0/1

Router(config-if)#ip add 3.0.0.1 255.0.0.0

Router(config-if)#no shut

Router(config-if)#

%LINK-5-CHANGED: Interface FastEthernet0/1, changed state to up

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up

exit

After assining the ip address to the routers and pc’s now we are doing ospf routing here.

Routing configuration on R1:

Router(config)#

Router(config)#router ospf 1

Router(config-router)#network 1.0.0.0 0.255.255.255 area 0

Router(config-router)#network 2.0.0.0 0.255.255.255 area 0

Router(config-router)#

Routing configuration on R2:

Router(config)#

Router(config)#

Router(config)#router ospf 1

Router(config-router)#network 2.0.0.0 0.255.255.255 area 0

Router(config-router)#network 3.0.0.0 0.255.255.255 area 0

Router(config-router)#

After assining the ip address and routing now we have to configure OSPF MD5 Authentication

OSPF MD5 Authentication on R1:

Router#config t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#int f0/1

Router(config-if)#ip ospf message-digest-key 1 md5 ccna123

Router(config-if)#ip ospf authentication message-digest

Router(config-if)#exit

OSPF MD5 Authentication on R2:

Router(config)#

Router(config)#int f0/0

Router(config-if)#ip ospf message-digest-key 1 md5 ccna123

Router(config-if)#ip ospf authentication message-digest

Router(config-if)#exit

Now how to check our OSPF MD5 Authentication is done or not

How To Check On R1

Router#show ip ospf int f0/1

How To Check On R2

Router#show ip ospf int f0/0

This is all how to configure OSPF MD5 Authentication with assining the ip addresss and routing