![]() ![]() The global configuration service password-encryption command encrypts all passwords configured. This presents a security risk because an attacker could easily find out passwords. Service password-encryption commandīy default, passwords configured using the enable password command and passwords for the console or telnet access are stored in clear text in the configuration file. Notice how the password ( cisco) is visible in the device’s configuration. The enable secret PASSWORD commands encrypts the password, while the enable password PASSWORD command doesn’t, which means that an unauthorized user could just read a password from the device configuration: HOSTNAME(config) enable password PASSWORDīoth of the commands above accomplish the same thing, but with one major difference. You can do that by setting up a password to enter the privileged EXEC mode. Therefore it is important to prevent an unauthorized user from entering the global configuration mode. Configure a password for the privileged EXEC mode – from the privileged EXEC mode you can enter the global configuration mode and change the configuration of a device.It is required in order for telnet to work. The login command allows a remote access to a device. So, this command usually looks like this: line vty 0 15. Cisco devices usually supports 16 concurrent VTY sessions. A virtual session can be a telnet or SSH session. The first command defines a range of virtual terminal sessions that you would like to configure. HOSTNAME(config) line vty FIRST_VTY LAST_VTY This is done using the following sequence of commands: Configure a password for the telnet access – by default, the telnet access is disabled.This will force a user to type the password when trying to access the device through the console port. You can configure a password for the console access by using the following set of commands: Configure a password for the console access – by default, the console access doesn’t requires a password.There are three basic ways to configure authentication on a device: You can remove any command from your IOS configuration by using the no keyword in front of the command.Įach Cisco IOS device has the built-in authentication features. What if you had made a mistake and written the ip address 10.0.0.2 255.0.0.0 command instead of the command above? Well, you can remove the wrong IP address by typing the same command, but this time with the no keyword in front of it, in our case no ip address. For example, if we want to assign an IP address of 10.0.0.1 with the subnet mask 255.0.0.0 to a interface, we would use the following command: ip address 10.0.0.1 255.0.0.0 ![]() The syntax of this command is ip address IP_ADDRESS SUBNET_MASK. The ip address interface mode command is used to assign an IP address to an interface. Once inside the interface mode, you can enable an interface by typing the no shutdown command. For the interface mode the HOSTNAME#(config-if) prompt is shown. You may notice that the promt has changed to reflect the mode you are currently in. You can get a list of available interfaces by typing the ‘?’ character after the interface command. You can do that by using the global configuration mode command interface INTERFACE_TYPE/ INTERFACE_NUMBER. You first need to enter the submode of the interface that you want to configure. To enable an interface, the no shutdown command is used. Notice how the prompt was changed to reflect the configured value.īy default, all interfaces on a Cisco router are turned off. ![]() Once inside the global configuration mode, type the command hostname R1. Here is an example that shows you how to change a hostname of a device.įirst, enter the global configuration mode by typing the enable command in the user EXEC mode and the configuration terminal command in the privileged EXEC mode. After typing the command, the prompt will change and display the new hostname. Because this command changes a device configuration, it must be entered in the global configuration mode. The hostname command is used to configure the device hostname. In this article we will go through some basic IOS commands. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |