qr code c# free 11: Cisco IOS Software in Objective-C

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11: Cisco IOS Software
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Cisco Router Firewall Security from Cisco Press) A local username database is a database on the router that allows you to specify both a username and a password to restrict access to the lines on the IOS device Using usernames and passwords is recommended over using only passwords on lines: the advantage of this approach is that each user can have his or her own password instead of sharing a password, providing for more accountability The following commands illustrate the setup of a local username database and its use on VTYs:
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IOS(config)# username name secret|password password IOS(config)# line vty 0 15 IOS(config-line)# login local
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The username command specifies the name and password for the user The main difference between the secret and password parameters is that the secret parameter tells the IOS to encrypt the password with an MD5 hash, and the password parameter doesn t (the password is stored in clear text) This is true of the Line Subconfiguration mode password command: it also is stored in clear text NOTE: The login local command can be used on any of the lines on the router to perform user authentication: console, auxiliary, VTYs, and TTYs
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Along with protecting access to the lines on an IOS device, you can also control access to Privilege EXEC mode by assigning a password to it Two configuration options are shown here:
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Switch(config)# enable password Privilege_EXEC_password
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Switch(config)# enable secret Privilege_EXEC_password
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Both of these commands configure the Privilege EXEC password The main difference between the two, as with the username command, is that the secret parameter encrypts the Privilege EXEC password and the password parameter doesn t If you configure both of these commands, the password configured with the enable secret command always takes precedence over the enable password command
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Passwords that are not encrypted can be encrypted by using the service password-encryption Global Configuration mode command However, the enable secret command s encryption is much stronger than using the service password-encryption command to do the encryption
Basic IOS Security Con guration
I recommend against using the enable password command or the username command with the password parameter, along with service password-encryption, since several easily accessible utilities on the Internet can be used to break this encryption: just do a search on Cisco password cracker using a search engine and you ll find a lot of them And even with a password-cracking program such as Cain and Abel or L0phtcrack, given enough time, the MD5 hashed encryption using the secret keyword can also be broken If someone steals your configuration file, you re vulnerable to an access attackThe best defense is protecting any access to your configuration file 1111 The CD includes a multimedia demonstration of configuring passwords on an IOS device
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Use the password command to secure User EXEC access and the enable password or enable secret command to secure Privilege EXEC access Remember that the enable secret command encrypts the
password With VTY access, you must also specify the login command within Line Subcon guration mode Use the service password-encryption command to encrypt clear-text passwords
Login Banners
You can set up a login banner on your IOS device that will display a message to every user attempting to access User EXEC mode The banner motd command is used to create the login banner:
IOS(config)# banner motd delimiting_char your_banner delimiting_char IOS(config)#
The motd (message of the day) is a carryover from the UNIX world After the banner motd command, you must enter the delimiting character, which is used to signify the beginning and ending of the banner it cannot appear in the actual banner Once you enter the delimiting character, when the IOS CLI parser sees this character later in your text, the IOS terminates the banner and returns you to the CLI prompt One nice feature of the banner is that pressing the ENTER key doesn t
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