Hi,
Jan 15, 2018 crypto key generate rsa Example: Switch (config)# crypto key generate rsa Enables the SSH server for local and remote authentication on the Switch and generates an RSA key pair. Generating an RSA key pair for the Switch automatically enables SSH. We recommend that a minimum modulus size of 1024 bits. Note When you upgrade to Cisco IOS XE Denali 16.3.5 the SSH access is lost, because it cannot use the CISCOIDEVIDSUDILEGACY RSA server key. Before upgrade, generate the server key using the crypto key generate rsa command in global configuration mode. To verify whether the RSA server key is available on your device, run the. Run show crypto key mypubkey rsa to see if you do, in fact, have a key fully generated and registered under a non-default name. Cd key generator for original starcraft. If there is, then you can tell the ssh process to use this key with ip ssh rsa keypair-name xxx. If the first command doesn't show anything useful then I'd say you can go ahead and generate a new key.
Are you aware of any inbound ACLs applied on the VTY lines? Maybe do a show access-list, show ip interface and show run commands to check if an ACL is blocking access on the terminal lines.
If its not an ACL issue, make sure you configured 'login local' on your VTY lines to make use of the local database when connecting in
Check also that you have not disabled SSH access into your VTY lines using the transport command.
Make sure 'transport input ssh telnet' or 'transport input telnet ssh' has been configured
Failing all that it could be an exec-timeout issue, maybe that has been set to low and its automatically logging you out, although this is more unlikely based on your report.
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.
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
Next, make sure the switch has a hostname and domain-name set properly.
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.
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.
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.
From the switch, if you do ‘sh ip ssh’, it will confirm that the SSH is enabled on this cisco device.
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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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