Cisco username command
With several different user accounts, you can also set different privilege level for each one of them. Different privilege means different available commands that can be executed per user account.
In this article, we will go deep on creating users accounts and all its features including privilege, encryption, and automation that we can implement in Cisco IOS devices. This article shows how you can manage user accounts and passwords in Cisco IOS devices. Basically you will need to create at least a user account in your Cisco router or switch if:.
The standard command to create user account and password in Cisco IOS is shown in the example below, and it must be executed in global configuration mode. With above configuration you have successfully created username Cisco IOS device. However, there is one major weakness in this configuration and it will be explained in this sub-section below.
When you define a password, it is stored with clear-text format in your running-configuration. In the show running-config output, the password will be shown as it is:.
Notice that your password phrase is explicitly written there. To solve this issue, we can apply encryption to the password and hide the exact passphrase. There are two types of encryption:. With the command service password-encryptionall existing and future added passwords will be automatically encrypted. As you can see above, password phrase in the show running-config output has been masked by a random numbers and letters.
It using MD5 algorithm to hide your original passphrase. To use type 5 encryption to secure passwords in Cisco IOS devices we can simply create username followed by a secret instead of password. The configuration will be demonstrated in the next example but first we will delete the username and password created earlier:.
And with this configuration we will re-create username using a secret :. In this section we will enforce login to the console command line. By issuing command login above, we told the device to always ask credential to any attempt of accessing the console command line. The word local is telling the device to look up its internal user account database for authentication, which means the device will refer to the list of username we created before. Now the device will ask for login credential on the next attempt of accessing CLI via console line.
You cannot enter configuration mode except from privileged EXEC mode. With the configuration below we will set authentication on any attempt to enter privileged EXEC mode using the enable command:.
As the result of this configuration, now a passphrase will be asked before we entering the privileged EXEC mode. We can enforce login on the remote access with similar configuration as the one we applied in the console line anyway, it is mandatory to have username and password in terminal line if we want to enable SSH With this configuration below we will enforce login to virtual terminal line:.
By default all user accounts are created using privilege level 1 and it is equivalent with user EXEC mode.The CLI is an interface, based on text.
You type in configuration commands and use show commands to get the output from the router or switch. This might sound dated but with so many commands that are available to use, the CLI is much easier to work with than any of the graphical interfaces. The console is a physical port on the switch that allows access to the CLI. We typically use this the first time we configure the switch. Telnet and SSH are both options for remote access. On the switch, you will find one or two physical connectors for the console.
Take a look at the picture below:. On the left side of this Catalyst switch, you see the light blue RJ45 port and a micro-USB port on the left of it.
Older switches only have the RJ45 port, newer switches and other devices often have both options.Shell tellus 22 hydraulic oil equivalent
We use this connection to connect the switch to a serial port on your computer with the following cable:. This cable is called a Cisco console cable and you will need a serial port on your computer. This cable emulates a serial port and has a USB connection. Once you have connected your computer to the switch, we can start a terminal application to access the CLI.
There are many terminal emulator applications. If you are new to this, the best one to start with is Putty. Once you have downloaded it, you will see the main screen:. The default speed is baud rate.How to make a text based mmorpg
Above you can see that on my computer, I have to use COM4. Change the COM port and click on Open to start the console:. Now is a good time to power on your switch or in case it is already powered on, pull the plug so it can reload. When the switch boots, you will see a lot of stuff on the console. First, it will initialize the flash memory:. Initializing the flash memory is required since it contains the IOS image Operating System of the switch. Its next step is to load the IOS image from the flash memory:.
You are then presented with some legal information and information about the switch:. This tells us the version of the IOS image. IOS is now up and running, it also initializes the flash memory:. You might be wondering what a switch has to do with cryptography. This allows encrypted remote access.
Another feature that uses cryptography is SNMP version 3, this is used by network management software to read statistics from the switch. In certain countries, cryptography is forbidden or limited. Above we can see the switch model, the interfaces it has, some serial numbers, etc.
It ends with the following message:.From global config mode you will be able to add the user you wish to login with. One thing to note this information will be stored in the running config which is plain text but after submitting the password it will be encrypted so when issuing a show run you will not be able to see the password.
When adding a user you will also specify the privilege level which if you are not familiar with privilege level it specifies the level of access the user has to modify configuration on the system. One thing to remember is when storing the password in the running and startup configuration it will encrypt it so someone simply looking at the config wont know your password.
Now if we show the running config we can see that our user shows up and the password is stored as an encrypted string.
At this point if we log all the way out and attempt to login again we will notice we were never prompted to login with our user, this is because we have not told the system to require a login on the console interface. In your running config you will be able to see that your line console interface does not have any configuration on it.
Now if we exit until we are presented with the initial console screen and hit enter we will see it prompts us for a username and password to login. Recently I was tracking down some performance issues on some of my switches and found myself checking the CPU and memory utilization quite often so I figured I would make this post, I show how […]. There are times where you need to specify the length and width of the terminal when issuing commands either to properly format the output to be parsed by scripts easier, or to eliminate the need […].
When making potentially intrusive changes or doing fail over testing and you do not have physical access to the device, it is a good practice to save the working config, schedule a reboot and make […]. Notify me of follow-up comments by email. Notify me of new posts by email. Router config t. Router config. Router config username kyle privilege 15 secret 0 P ssword Router config. Router config username kyle privilege 15 secret 0 P ssword.
Router config exit. Router show run section user. Router show run sec line line con 0 line aux 0 line vty 0 4 login Router. Router show run sec line. Router conf t Enter configuration commands, one per line.
Router conf t. Enter configuration commandsone per line. Router config line con 0. Router config - line login local. Router config - line exit. Username: kyle Password: P ssword Router. Router con0 is now available.To establish a username-based authentication system, use the username command in global configuration mode. To remove an established username-based authentication, use the no form of this command.
Hostname, server name, user ID, or command name. The name argument can be only one word. Blank spaces and quotation marks are not allowed. Optional Specifies an outgoing access list that overrides the access list specified in the access-class command available in line configuration mode. Optional Causes the specified command to be issued automatically after the user logs in. When the command is complete, the session is terminated. Because the command can be any length and can contain embedded spaces, commands using the autocommand keyword must be the last option on the line.
Optional For asynchronous callback only: permits you to specify a telephone number to pass to the DCE device. Optional For asynchronous callback only: relative number of the terminal line or the first line in a contiguous group on which you enable a specific username for callback. Numbering begins with zero. Optional Relative number of the last line in a contiguous group on which you want to enable a specific username for callback.
Cisco Commands Cheat Sheet
If you omit the keyword such as ttythen line-number and ending-line-number are absolute rather than relative line numbers. Optional For asynchronous callback only: permits you to specify a rotary group number on which you want to enable a specific username for callback. The next available line in the rotary group is selected. Range: 1 to Optional Prevents a user from using an escape character on the host to which that user is connected.
Optional Prevents Cisco IOS software from disconnecting the user after an automatic command set up with the autocommand keyword has completed.
Instead, the user gets another EXEC prompt.
No password is required for this user to log in. This is usually the most useful keyword to use in combination with the autocommand keyword. Specifies the password to access the name argument. A password must be from 1 to 25 characters, can contain embedded spaces, and must be the last option specified in the username command.Canon eos rebel xs 1000d sample photos
Single-digit number that defines whether the text immediately following is encrypted and if so, what type of encryption is used. Defined encryption types are 0, which means that the text immediately following is not encrypted, and 7, which means that the text is encrypted using a Cisco-defined encryption algorithm.Our new learning portfolio unlocks possibilities for both network engineers and software programmers.
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Time 10 hrs 24 mins. Featured members. Martin L. Sarah - Community Manager. Rigo - Community Moderator. All members. How to join Joining the Cisco Learning Network is as simple as registering. Subscribe to our newsletters Subscribe to Learning Cisco Communications for additional resources delivered right to your inbox. Follow Us.Several types of passwords can be configured on a Cisco router, such as the enable password, the secret password for Telnet and SSH connections and the console port as well.
All these password locations represent good access locations for passwords, but if you have only one password on only one access location, you should at least have an enable password.
The last several versions of the Cisco IOS for routers force you to set up passwords on the first boot if you have not already enabled passwords. This password gives you security on your router, because Privileged EXEC mode is where all the dangerous commands are located, including access to Global Configuration mode.
Creating Users on a Cisco Router
To set an enable password, use the following command:. This command creates an enable password that is stored in your configuration file. To view this password, show the running configuration using the following command:. You may immediately see the problem here. The password is stored in plain text in your configuration file, thus anyone who has access to your configuration file can easily read the password.
When you configure both an enable and a secret password, the secret password is the password that will be used to switch from User Exec mode to Priv Exec mode.
The following code sets both passwords for your router:. Most encrypted passwords in your configuration file use a weak reversible encryption and are identified by a 7 in the password line, whereas the secret password is encrypted with a one-way MD5 hash with a 5 denoted in the password line. You may also see a 0, which identifies it as an unencrypted password. Cisco Router Passwords: Enable and Secret.
Configuring Local Username and Password on a Cisco IOS Router
About the Book Author Edward Tetz has worked with computers as a sales associate, support tech, trainer, and consultant.There are mainly two ways to authenticate to a Cisco router device and also to other networking devices in general. In this article we will discuss how to setup a local username and password on a Cisco router in order to authenticate when connecting to the device for management purposes.
The same principles apply also to other Cisco devices such as switches, firewalls etc. Employing an additional level of authentication i. Moreover, configuring local usernames on the device gives you the flexibility to add granularity regarding the levels of management privileges for different users although using an external AAA server for authentication and authorization purposes is better compared to local accounts.
For example, you can configure a username on the router with full privileges privilege level 15 who can configure anything on the router, or you can configure a username with unprivileged access privilege level 1 who can only see a few things on the router and nothing else.
There are two steps involved to configure local usernames. The second step is to configure your VTY lines 0 to 4 to require a local login access i. Router config line vty 0 4 Router config-line login local Router config-line exit. Router config line console 0 Router config-line login local Router config-line exit.
Router config line aux 0 Router config-line login local Router config-line exit. Just a security tip here, for username select something difficult to guess or something that will not be found in dictionary attacks. A simple dictionary attack from a hacker will find those easily. Moreover, if you have more than one administrator user connecting to your routers, its better to configure a different personalized username for each administrator. This will help to ensure tracking and auditing in order to know what each user did on the device and when each user connected to the device.
Configure non-encrypted password avoid this type Router config enable password somepassword.
Manage User Accounts and Passwords in Cisco IOS Devices
Configure encrypted password recommended Router config enable secret strongpassword. The enable secret command provides better security by storing the configured enable secret password using a nonreversible cryptographic hash function, compared to the enable password command, which stores the configured password in clear text or in an easily reversible encrypted format.
Storing the password as a cryptographic hash helps to minimize the risk of password sniffing if the router configuration file is transferred across the network, such as to and from a TFTP server. It is also useful if an unauthorized user obtains a copy of your configuration file. Note, if neither the enable password command nor the enable secret command is configured, and if there is a line password configured for the console port, the console line password will serve as the enable password for all VTY lines, which includes Telnet, rlogin, and SSH connections.
By default, only the enable secret password is encrypted. Router configure terminal Enter configuration commands, one per line. To encrypt local router passwords, use the service password-encryption command in global configuration mode as shown above. This command applies to line passwords, username passwords, enable passwords, and authentication key passwords, including routing authentication passwords and key strings.
By default, IOS does not encrypt passwords. This command is widely available within IOS. Is it possible to connect directly to the five privilege when I connect with the username nedge and pwd cisco?
If the username is local i.
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