Q: I have a Cisco switch in my network, which I can access by hooking up a console cable directly to the device. I like to access the switch remotely using SSH. How can I enable ssh on my Cisco 3750 Catalyst Switch?
A: By default, when you configure a Cisco device, you have to use the console cable and connect directly to the system to access it. Follow the steps mentioned below, which will enable SSH access to your Cisco devices. Once you enable SSH, you can access it remotely using PuTTY or any other SSH client.
1. Setup Management IP
Putty itself can’t generate any RSA keys but we can do this with PuTTY gen (PuTTY Key Generator). Once you start it, you will see the main screen: The default settings are fine, we will generate a 2048 bit RSA keypair. Hit the generate button and you will see this: To generate a random key, PuTTY key generator uses the input of your mouse movement. Nov 17, 2016 How to login Cisco router with SSH key. Imtiaz November 17, 2016 Cisco / Security. Hello everyone. Today I will show you how to login Cisco router using ssh key. We will enable ssh on the router and then generate a key on an Ubuntu Linux server and using that key we will login to our router. #crypto key generate rsa The name for the keys. I followed below steps to enable SSH in cisco 3560 switch. Configure terminal. Hostname hostname. Ip domain-name domainname. Crypto key generate rsa. After configuration when i ssh on switch it ask for username/password. Login as: cisco. [email protected]'s password.
First, make sure you have performed basic network configurations on your switch. For example, assign default gateway, assign management ip-address, etc. If this is already done, skip to the next step.
In the following example, the management ip address is set as 192.168.101.2 in the 101 VLAN. The default gateway points to the firewall, which is 192.168.101.1
2. Set hostname and domain-name
Next, make sure the switch has a hostname and domain-name set properly.
3. Generate the RSA Keys
The switch or router should have RSA keys that it will use during the SSH process. So, generate these using crypto command as shown below.
Also, if you are running on an older Cisco IOS image, it is highly recommended that you upgrade to latest Cisco IOS.
4. Setup the Line VTY configurations
Setup the following line vty configuration parameters, where input transport is set to SSH. Set the login to local, and password to 7.
If you have not set the console line yet, set it to the following values.
5. Create the username password
If you don’t have an username created already, do it as shown below.
Note: If you don’t have the enable password setup properly, do it now.
Make sure the password-encryption service is turned-on, which will encrypt the password, and when you do “sh run”, you’ll seee only the encrypted password and not clear-text password.
5. Verify SSH access
From the switch, if you do ‘sh ip ssh’, it will confirm that the SSH is enabled on this cisco device.
After the above configurations, login from a remote machine to verify that you can ssh to this cisco switch.
In this example, 192.168.101.2 is the management ip-address of the switch.
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ContentsIntroduction
Secure Shell (SSH) is a protocol which provides a secure remote access connection to network devices. Communication between the client and server is encrypted in both SSH version 1 and SSH version 2. Implement SSH version 2 when possible because it uses a more enhanced security encryption algorithm.
This document discusses how to configure and debug SSH on Cisco routers or switches that run a version of Cisco IOS® Software that supports SSH. This document contains more information on specific versions and software images.
PrerequisitesRequirements
The Cisco IOS image used must be a k9(crypto) image in order to support SSH. For example c3750e-universalk9-tar.122-35.SE5.tar is a k9 (crypto) image.
Components Used
The information in this document is based on Cisco IOS 3600 Software (C3640-IK9S-M), Release 12.2(2)T1.
SSH was introduced into these Cisco IOS platforms and images:
Refer to the Software Advisor (registered customers only) for a complete list of feature sets supported in different Cisco IOS Software releases and on different platforms.
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are in a live network, make sure that you understand the potential impact of any command before you use it.
Conventions
Refer to Cisco Technical Tips Conventions for more information on document conventions.
SSH v1 vs. SSH v2
Use the Cisco Software Advisor (registered customers only) in order to help you find the version of code with appropriate support for either SSH v1 or SSH v2.
Network DiagramTest AuthenticationAuthentication Test without SSH
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.'
Authentication Test with SSH
In order to test authentication with SSH, you have to add to the previous statements in order to enable SSH on Carter and test SSH from the PC and UNIX stations.
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 this does not work, see the debug section of this document.
Optional Configuration SettingsPrevent Non-SSH Connections
If you want to prevent non-SSH connections, add the transport input ssh command under the lines to limit the router to SSH connections only. Straight (non-SSH) Telnets are refused.
Test to make sure that non-SSH users cannot Telnet to the router Carter.
Set Up an IOS Router or Switch as SSH Client
There are four steps required to enable SSH support on a Cisco IOS router:
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. These devices are then 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.
Issue this command to SSH from the Cisco IOS SSH client (Reed) to the Cisco IOS SSH server (Carter) in order to test this:
Setup an IOS Router as an SSH server that performs RSA based User Authentication
Doom cd key generator torrent 2017. Complete these steps in order to configure the SSH server to perform RSA based authentication.
Add SSH Terminal-Line Access
If you need outbound SSH terminal-line authentication, you can configure and test SSH for outbound reverse Telnets through Carter, which acts as a comm server to Philly.
If Philly is attached to Carter's port 2, then you can configure SSH to Philly through Carter from Reed with the help of this command:
You can use this command from Solaris:
Restrict SSH access to a subnet
You need to limit SSH connectivity to a specific subnetwork where all other SSH attempts from IPs outside the subnetwork should be dropped.
You can use these steps to accomplish the same:
This is an example configuration. In this example only SSH access to the 10.10.10.0 255.255.255.0 subnet is permitted, any other is denied access.
Note: The same procedure to lock down the SSH access is also applicable on switch platforms.
Configure the SSH Version
Configure SSH v1:
Configure SSH v2:
Configure SSH v1 and v2:
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Note: You receive this error message when you use SSHv1:
Note: Cisco bug ID CSCsu51740 (registered customers only) is filed for this issue. Workaround is to configure SSHv2. https://nanosupernal.weebly.com/avs-video-editor-72-activation-key-generator.html.
Variations on banner Command OutputGenerate Rsa Key Pair
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.
Unable to Display the Login Banner
SSH version 2 supports the login banner. The login banner is displayed if the SSH client sends the username when it initiates the SSH session with the Cisco router. For example, when the Secure Shell ssh client is used, the login banner is displayed. When the PuTTY ssh client is used, the login banner is not displayed. This is because Secure Shell sends the username by default and PuTTY does not send the username by default.
The Secure Shell 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 screenshot shows that the login banner is displayed when Secure Shell connects to the router. Then, the login banner password prompt displays.
The PuTTY client does not require the username to initiate the SSH connection to the router. This screenshot shows that the PuTTY client connects to the router and prompts for the username and password. It does not display the login banner.
This screen shot shows that the login banner is displayed when PuTTY is configured to send the username to the router.
debug and show Commands
Before you issue the debug commands described and illustrated here, refer to Important Information on Debug Commands. Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
Sample Debug OutputRouter Debug
Note: Some of this good debug output is wrapped to multiple lines because of spatial considerations.
Server Debug
Note: This output was captured on a Solaris machine.
What can go Wrong
These sections have sample debug output from several incorrect configurations.
SSH From an SSH Client Not Compiled with Data Encryption Standard (DES)Solaris DebugRouter DebugBad PasswordRouter DebugSSH Client Sends Unsupported (Blowfish) CipherRouter DebugGeting the '%SSH-3-PRIVATEKEY: Unable to retrieve RSA private key for' Error
If you receive this error message, it may be caused due to any change in the domain name or host name. In order to resolve this, try these workarounds.
Cisco bug ID CSCsa83601 (registered customers only) has been filed to address this behaviour.
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