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This chapter is from the book

CCIE Security Practice Labs (CCIE Self-Study)CCIE Security Practice Labs (CCIE Self-Study)

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This chapter is from the book

This chapter is from the book

CCIE Security Practice Labs (CCIE Self-Study)CCIE Security Practice Labs (CCIE Self-Study)

Learn More Buy

Section 8.0: Advanced Security

8.1: Password Protection

  1. Configure service password-encryption on all the routers to encrypt the enable password; otherwise, they will appear in clear text in the configuration.

8.2: EXEC Authentication

  1. Configure enable secret on R2.

  2. Configure authentication for shell EXEC without using the AAA engine using the enable use-tacacs command. Note that this is not TACACS+ but TACACS server (without the +). CiscoSecure ACS is not a TACACS server but TACACS+ only.

  3. Configure fallback to pass authentication in the event the TACACS server is down or not found using enable last-resort succeed.

8.3: Access Control

  1. In this case, you can configure autocommand for a user to Telnet to the router. autocommand will execute the required command and exit the session. This way the user will not be able to keep its Telnet session:

    2. username testconfig privilege 15 password 7 15060E1F1029242A2E3A32
username testconfig autocommand show run
!
line vty 0 4
 privilege level 15
 password 7 110A1016141D
 login local
!
end

    Test by Telnetting from R1 to 10.50.13.2.

    r1#telnet 10.50.13.2
Trying 10.50.13.2 ... Open

User Access Verification

Username: testconfig
Password: testconfig
Building configuration...

Current configuration : 7022 bytes
!
! Last configuration change at 23:46:49 AEDT Sun Jan 19 2003
! NVRAM config last updated at 00:15:25 AEDT Mon Jan 20 2003
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname r3
!
snipped
!
end

[Connection to 10.50.13.2 closed by foreign host]
r1#

    As you can see, as soon as the show run command output finished, the session was closed.

  2. Configure R5 Telnet access to permit host 133.133.133.133 only:

    3. access-list 3 permit 133.133.133.133
!
line vty 0 4
 access-class 3 in
 password 7 13061E010803
 login
!
end

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