• Key Generator
• Key Generate Software

Contents

Introduction

Jul 28, 2011 How to enable SSH on Cisco Router running IOS commands used in this video commands used in this video: show crypto key mypubkey rsa show clock show ip ssh hostname macedoniart1 ip domain-name. Mar 18, 2016  Symptom: Smart install should be able to generate crypto key for ssh Conditions: As of now post-install commands are not supported by Smart installation. Cisco Catalyst 3750-E Series Switches; Cisco Catalyst 2960-24-S Switch. Symptom: Smart install should be able to generate crypto key for ssh Conditions.

This document gives step-by-step instructions to configure Secure Shell (SSH) Version 1 on Catalyst switches running Catalyst OS (CatOS). The version tested is cat6000-supk9.6-1-1c.bin.

Prerequisites

Requirements

Jan 19, 2006  If the hostname was changed and SSH is no longer working, then zeroize the new key and create another new key with the proper label. Crypto key zeroize rsa crypto key generate rsa general-keys label (label) mod (modulus) exportable Do not use anonymous RSA keys (named after the FQDN of the switch). Use labeled keys instead. The private key has to be protectedmake sure it doesn’t leave your computer. In this lesson, we will generate a public and private key on a Windows and Linux computer. We will then add the public key to a Cisco IOS router and use it for SSH authentication. How to create self-signed certificates An article by Fabio Semperboni Tutorial A digital certificate or identity certificate is an electronic document which uses a digital signature to bind a public key with an identity, information such as the name of a person or an organization, their address, and so forth. I was working on a Cisco 3750-G last week, and I was in the process of setting up SSH access. When I went to generate the crypto key and enable SSH, It fired an. No crypto commands on 3750G Yes K9 is the key (no pun intended). The other bit to watch for is the config-register. 0x2102 is the setting most commonly used so that the device loads the image specified in the startup-config as opposed to the first image in flash (or other alternative location).

This table shows the status of SSH support in the switches. Registered users can access these software images by visiting the Software Center.

* Configuration is covered in Configuring Secure Shell on Routers and Switches Running Cisco IOS.

** There is no support for SSH in 12.1E train for Catalyst 4000 running Integrated Cisco IOS Software.

Refer to Encryption Software Export Distribution Authorization Form in order to apply for 3DES.

This document assumes that authentication works prior to implementation of SSH (through the Telnet password, TACACS+) or RADIUS. SSH with Kerberos is not supported prior to the implementation of SSH.

Components Used

This document addresses only the Catalyst 2948G, Catalyst 2980G, Catalyst 4000/4500 series, Catalyst 5000/5500 series, and Catalyst 6000/6500 series running the CatOS K9 image. For more details, refer to the Requirements section of this document.

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 working in a live network, ensure that you understand the potential impact of any command before using it.

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

Network Diagram

Switch Configuration

Disabling SSH

In some situations it may be neccessary to disable SSH on the switch. You must verify whether SSH is configured on the switch and if so, disable it.

To verify if SSH has been configured on the switch, issue the show crypto key command. If the output displays the RSA key, then SSH has been configured and enabled on the switch. An example is shown here.

To remove the crypto key, issue the clear crypto key rsa command to disable SSH on the switch. An example is shown here.

debug in the Catalyst

To turn on debugs, issue the set trace ssh 4 command.

To turn off debugs, issue the set trace ssh 0 command.

debug Command Examples of a Good Connection

Solaris to Catalyst, Triple Data Encryption Standard (3DES), Telnet Password

Solaris

Catalyst

PC to Catalyst, 3DES, Telnet Password

Catalyst

Solaris to Catalyst, 3DES, Authentication, Authorization, and Accounting (AAA) Authentication

Solaris

Catalyst

debug Command Examples of What Can Go Wrong

Catalyst debug with Client Attempting [unsupported] Blowfish Cipher

Catalyst debug with Bad Telnet Password

Catalyst debug with Bad AAA Authentication

Troubleshoot

This section deals with different troubleshooting scenarios related to SSH configuration on Cisco switches.

Cannot Connect to Switch through SSH

Problem:

Cannot connect to the switch using SSH.

The debug ip ssh command shows this output:

Solution:

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This problem occurs because of either of these reasons:

• New SSH connections fail after changing the hostname.

• SSH configured with non-labeled keys (having the router FQDN).

The workarounds for this problem are:

• If the hostname was changed and SSH is no longer working, then zeroize the new key and create another new key with the proper label.

• Do not use anonymous RSA keys (named after the FQDN of the switch). Use labeled keys instead.

In order to resolve this problem forever, upgrade the IOS software to any of the versions in which this problem is fixed.

A bug has been filed about this issue. For more information, refer to Cisco bug ID CSCtc41114 (registered customers only) .

Related Information

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. American truck simulator cd key generator.

1. Setup Management IP

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.

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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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