Learn Linux CCNA CEH IPv6 Cyber-Security Online

In this tutorial we will learn how to configure EIGRP Authentication on cisco router using cisco packet tracer.This lab is based on EIGRP Authentication using MD5 hashing Algorithm.To encrypt every message the MD5 algorithm is used. EIGRP Authentication is configured to prevent the hackers from forming the EIGRP neighbor relationship with your router and advertising incorrect routing information.

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RIP Clear Text Authentication Lab

To perform this EIGRP Authenication Configuration Lab i have used Cisco Packet Tracer software here.

Step1:Configure IP address on Router R1

Router>enable

Router#config t

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

Router(config)#host R1

R1(config)#int fa0/0

R1(config-if)#ip add 1.0.0.1 255.0.0.0

R1(config-if)#no shut

EIGRP Configuration on Router R1

R1(config)#router eigrp 1

R1(config-router)#network 1.0.0.0

R1(config-router)#exit

Step2: Configure IP Address on Router R2

Router>enable

Router#config t

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

Router(config)#Host R2

R2(config)#int fa0/0

R2(config-if)#ip add 1.0.0.2 255.0.0.0

R2(config-if)#no shut

EIGRP Configuration on Router R2.

R2#config t

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

R2(config)#router eigrp 1

R2(config-router)#network 1.0.0.0

Now it’s time to EIGRP Authentication

EIGRP AUTHENTICATION ON ROUTER R1:

R1#config t

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

R1(config)#key chain satishkey

R1(config-keychain)#key 1

R1(config-keychain-key)#key-string 123

R1(config-keychain-key)#end

R1#config t

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

R1(config)#int fa0/0

R1(config-if)#ip authentication mode eigrp 1 md5

R1(config-if)#ip authentication key-chain eigrp 1 satishkey

EIGRP AUTHENTICATION ON ROUTER R2:

R2#config t

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

R2(config)#key chain satishkey

R2(config-keychain)#key 1

R2(config-keychain-key)#key-string 123

R2(config-keychain-key)#end

R2#config t

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

R2(config)#int fa0/0

R2(config-if)#ip authentication mode eigrp 1 md5

R2(config-if)#ip authentication key-chain eigrp 1 satishkey

  Testing EIGRP Authentication

R2#debug eigrp packets

EIGRP Packets debugging is on

(UPDATE, REQUEST, QUERY, REPLY, HELLO, ACK )

R2#

EIGRP: Received packet with MD5 authentication, key id = 1

EIGRP: Received HELLO on FastEthernet0/0 nbr 1.0.0.1

AS 1, Flags 0x0, Seq 2/0 idbQ 0/0

EIGRP: Sending HELLO on FastEthernet0/0

AS 1, Flags 0x0, Seq 2/0 idbQ 0/0 iidbQ un/rely 0/0