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Physical and Environmental Threats
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Many network administrators forget that the first line of defense in securing their network devices includes protecting against physical and environmental threats, including the following:
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Restricting physical access to the router via physical measures, such as locked doors, key cards, video cameras, and so on Ensuring that equipment is protected from power surges/spikes, brownouts, and loss of power
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11: Cisco IOS Software
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Protecting equipment from temperatures that are too cold or too hot or from too much humidity Ensuring that you follow electrostatic discharge procedures when handling sensitive electronic parts, have spares on hand for critical parts, and properly label equipment and cables
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An in-depth discussion of these issues is beyond the scope of this book; however, it is covered in a little bit more depth in Cisco s Securing Network Devices (SND) course
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The most common way of restricting physical access to IOS devices is to use some type of user authentication For example, you can configure passwords to restrict access to the lines on IOS devices (User EXEC mode) as well as access to Privilege EXEC mode Configuring passwords on Catalyst IOS switches, such as the 2950s and 2960s, is the same as configuring passwords on IOS routers The following sections discuss the configuration of passwords on IOS devices
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User EXEC Password Protection
Controlling access to User EXEC mode on an IOS device is accomplished on a line-by-line basis: console, auxiliary, TTYs, and VTYs Remember that not all devices support auxiliary ports, only routers support TTYs, and the number of VTYs an IOS device supports is product-dependent, ranging from five VTYs (0 4) to almost a thousand To secure the console port, you must first go into the console s Line Subconfiguration mode with the line console 0 command to configure the line password:
IOS(config)# line console 0 IOS(config-line)# password console_password
The 0 in the first command specifies the console port Lines and interfaces are numbered from 0 upward Even though the IOS devices have only a single console port, it is designated as 0 Next, notice that the prompt on the second line changed Once you are in Line Subconfiguration mode, you can use the password command to assign the console password Passwords on IOS devices are case-sensitive Remember that the password command, when executed under line console 0, sets the User EXEC password for someone trying to access the IOS device from the console port only
Basic IOS Security Con guration
The auxiliary port is typically used as a backup console port or a remote access port with a modem attached to it The following code shows the syntax for setting up password authentication on the auxiliary port:
Router(config)# line aux 0 Router(config-line)# password console_password Router(config-line)# exit
To set up a telnet password for your VTYs, use this configuration:
IOS(config)# line vty 0 15 IOS(config-line)# password telnet_password IOS(config-line)# login
The vty parameter in this command refers to virtual terminal, a fancy name for telnet or SSH access The 2950 and 2960 switches support up to 16 simultaneous VTY sessions, where each connection is internally tracked by a number: 0 15 Depending on the router model and IOS software version, this number might range from 5 (0 4) on up to almost 1000 You could assign a different password to each VTY, but then you wouldn t know which password to use when telnetting into the IOS device However, the IOS allows you to specify all 16 VTYs with the line command, simplifying your configuration, as in the preceding configuration: line vty 0 15 You need to specify the beginning and ending VTY numbers on the same line Once you are in Line Subconfiguration mode, use the password command to set your password You also need to enter the login command to allow remote access to the IOS this tells the IOS to use the password configured with the password command on the specified line
By default, only the rst ve VTYs (0 4) are enabled On devices that support more VTYs, they must manually be enabled When you remotely log into your IOS device using telnet, and you see the message Password required but none set,
then you have not con gured a password on the line with the password command and won t be able to log in until you con gure it Remember that you should secure your VTYs with a password and login process
Other ways of validating access are available, such as a local username database or through an external authentication server (The configuration of an authentication server is beyond the scope of this book For an in-depth discussion, see my book
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