Cisco Packet Tracer Username And Password

[Idara Viengxay]

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The first time that you log in to your switch through the console, you have to use the default username and password, which is cisco. You are then prompted to enter and configure a new password for the Cisco account. Password complexity is enabled by default. If the password that you choose is not complex enough, you are prompted to create another password.

Since passwords are used to authenticate users accessing the device, simple passwords are potential security hazards. Therefore, password complexity requirements are enforced by default and may be configured as necessary.

This article provides instructions on how to define basic password settings, line password, enable password, service password recovery, password complexity rules on the user accounts, and password aging settings on your switch through the Command Line Interface (CLI).

Step 5. Enter Privileged EXEC mode with the enable command. In the Privileged EXEC mode of the switch, save the configured settings to the startup configuration file, by entering the following:

When you configure a new enable password, it is automatically encrypted and saved to the running configuration file. No matter how the password was entered, it will appear in the running configuration file with the keyword encrypted together with the encrypted password.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

First test the authentication without SSH to make sure that authentication works with the router Carter before you add SSH. Authentication can be with a local username and password or with an authentication, authorization, and accounting (AAA) server that runs TACACS+ or RADIUS. (Authentication through the line password is not possible with SSH.) This example shows local authentication, which lets you Telnet into the router with username cisco and password cisco.

At this point, the show crypto key mypubkey rsa command must show the generated key. After you add the SSH configuration, test your ability to access the router from the PC and UNIX station.

If you want to have one device act as an SSH client to the other, you can add SSH to a second device called Reed. This puts these devices in a client-server arrangement, where Carter acts as the server, and Reed acts as the client. The Cisco IOS SSH client configuration on Reed is the same as required for the SSH server configuration on Carter.

The banner command output varies between the Telnet and different versions of SSH connections. This table illustrates how different banner command options work with various types of connections.

SSH version 2 supports the log in banner. When it initiates the SSH session with the Cisco router, the log in banner is displayed if the SSH client sends the username. For example, when the Secure Shell ssh client is used, the log in banner is displayed. When the PuTTY ssh client is used, the log in banner is not displayed. This is because SSH sends the username by default and PuTTY does not send the username by default.

The SSH client needs the username to initiate the connection to the SSH enabled device. The Connect button is not enabled if you do not enter the host name and username. This screen image shows that the log in banner is displayed when SSH connects to the router. The banner then prompts for a password.

The PuTTY client does not require the username to initiate the SSH connection to the router. This screen image shows that the PuTTY client connects to the router and prompts for the username and password. It does not display the log in banner.

Before you issue the debug commands described here, refer to Important Information on Debug Commands. Certain show commands are supported by the Output Interpreter Tool (registered to customers only), which allows you to view an analysis of show command output.

If your SSH configuration commands are rejected as illegal commands, you have not successfully generated a RSA key pair for your router. Ensure you have specified a host name and domain. Then use the crypto key generate rsa command to generate a RSA key pairs and enable the SSH server.

SSH uses either local security or the security protocol configured through AAA on your router for user authentication. When you configure AAA, you must ensure that the console is not run under AAA. Apply a keyword in the global configuration mode to disable AAA on the console.

This output suggests that the SSH server is disabled or not enabled properly. If you have already configured SSH, it is recommended that you reconfigure the SSH server in the device. Complete these steps in order to reconfigure the SSH server on the device.

There are mainly two ways to authenticate to a Cisco router device (and also to other networking devices in general). Using an external authentication service (such as AAA server, Radius, TACACS etc) or by having local usernames and passwords on the device itself.

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.

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 first one is to create the username/password and assign it a privilege level (from 1 to 15, with 15 being the most privileged level).

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.

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.

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, IOS does not encrypt passwords. Encrypting passwords in this way helps to minimize the risk of password sniffing if the router configuration file is transferred across the network such as to and/or from a TFTP server.

Harris Andrea is an Engineer with more than two decades of professional experience in the fields of TCP/IP Networks, Information Security and I.T. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc.

hi, I create a username and pwd with privilege 5 and I also activated the AAA authentication.when I connect with the username (nedge) and CDM (cisco) I refer to privililge 15. Is it possible to connect directly to the five privilege when I connect with the username (nedge) and pwd (cisco)?

AAA functionality in Cisco switch can be used as a centralized solution to secure and control user access to switches. Cisco switches are capable of implementing AAA functionality with either TACACS+ protocol (Cisco proprietary) or RADIUS protocol. To use AAA you need to enable it and then connect it to an AAA service hosted in a server.

Under the network section, type the client name, which will be the name of your switch? Next set the client IP. Here your switch is the client to the AAA server. The IP of VLAN1 is the client IP. Finally, select the server type as tacacs and click on add button.

This configuration will define what you can do once you get onto the switch after a successful authentication. When you configure authorization in cisco switch, it always queries the AAA server (RADIUS or TACACS+ server)

After defining the authorization, you need to apply the authorization to a line so that the users get authorized to specific task by the AAA sever every time they logon to the switch using that specific line. But the packet tracer 7 does not have any option to apply authorization to a specific line. So, you can use the following command to allow the switch to use AAA authorization for all lines.

Cisco routers have three methods of representing passwords in the configuration file. From weakest to strongest, they include clear text, Vigenere encryption, and MD5 hash algorithm. Clear-text passwords are represented in human-readable format. Both the Vigenere and MD5 encryption methods obscure passwords, but each has its own strengths and weaknesses.

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