Jan 01, 2020  I then ran the crypto key generate rsa command to generate another key pair and still got the same end date. I then checked the version of my other switches in the network to see why they were not alerting about certificate end date and they were using. Sep 11, 2019 Symptom: restore configuration 'ssh key rsa 2048' with ascii config Conditions: Some customer is using 'ssh key rsa 2048'. They backup configuration as a ascii text (copy startup-config ). So this configuration will reject by 'ssh server is enabled, cannot delete/generate the keys'. I propose to enhance behavior of enter 'ssh key rsa. Find answers to When does a Cisco router lose it's RSA key when it reloads? Action 1.3 syslog msg 'EEM RSA Generation' This will generate a new key every 120.

• Generate Rsa Key Command
• Generate Rsa Key Cisco Nexus 7
• Generate Rsa Key Cisco Nexus 6
• Crypto Key Generate Rsa Command

Generate Rsa Key Command

Cisco IOS SSH Version 2 (SSHv2) supports keyboard-interactive and password-based authentication methods. The SSHv2 Enhancements for RSA Keys feature also supports RSA-based public key authentication for the client and the server.

RSA based user authentication uses a private/public key pair associated with each user for authentication. The user must generate a private/public key pair on the client and configure a public key on the Cisco IOS SSH server to complete the authentication.

An SSH user trying to establish the credentials provides an encrypted signature using the private key. The signature and the user’s public key are sent to the SSH server for authentication. The SSH server computes a hash over the public key provided by the user. The hash is used to determine if the server has a matching entry. If a match is found, an RSA-based message verification is performed using the public key. Hence, the user is authenticated or denied access based on the encrypted signature.

What do we need?

• A SSH client that support RSA authentication (SecureCRT, Putty, …)
• A private/public key pair for each user
• An IOS that support this feature (in this example, I use IOS version 15)

How to configure the router?
1. Generate a private/public key pair on the client; for instance:

• SecureCRT: go to “Tools” -> “Create Public Key” key
• Putty: use the “puttygen” software

2. Copy the public key on the Cisco IOS SSH server.

For istance, to associate the “ciscozine” username with the public key:

Note: After typing the “key-string” command, copy the entire public key that you have made before.

As you see below, the IOS will save only the public key hash:

Generate Rsa Key Cisco Nexus 7

Now you can log into your routerwithout typing the password!

Below the video that explain how to perform SSH RSA User Authentication:
Backuptrans android whatsapp to iphone transfer key generator.

Remember:
If you copy a “no standard” public key, you will see this warning message:

Reference:

In this lesson, we will learn how to configure SSH on Cisco IOS enabled devices. This tutorial will show you how to enable SSH, generating RSA key, and then allowing on SSH remote management protocol under the VTY interfaces. This will also show you how to add more security in SSH access and some best practice on SSH services.

If you don’t know about SSH (Secure Shell), then it’s been a secure and reliable way to connect a remote device and It works on port 22. If you want to know more about SSH, then please check RFC 4253.

We will configure SSH in few steps. So, let’s configure SSH on Cisco ISO devices.

First of all, let’s configure the hostname of the device. We will call it “IOS”.

Now, we need to configure a domain name for our system. We will call it letsconfig.local.

We have configured hostname and domain-name because they are needed to generate RSA key. We have configured hostname as IOS and domain-name as letsconfig.local; so, our RSA key name will be IOS.letsconfigu.com. Let’s generate it.

Please note that, we have option to choose key module from 360 to 4096. The higher the number is, it’s more strong and secure. https://filesnew355.weebly.com/blog/myriad-pro-bold-mac-download. Here we will choose 2048.

Our key is ready as well as SSH is enabled. Now, let’s configure VTY and allow only ssh.

Generate Rsa Key Cisco Nexus 6

“transport input ssh” means, we are allowing only ssh here. And then allowing login with local username. If you still didn’t configure the local user, then let’s configure it.

Crypto Key Generate Rsa Command

Verification

Now, let’s verify our ssh by using “show ip ssh” command.

Sure enough, our SSH is active. However, we can see our current version is 1.99. It’s actually not a version, this mean, it support both v1 and v2 ssh. We will only use ssh v2 for better security. Below command will help to make it version 2. You can check SSH wikipedia link for more details.

After applying it, let’s verify again.

If a user is connected through SSH, you can use to “show ssh” command to verify it.