Cisco Rsa Key Generation Command
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Jun 11, 2019 SW1 ( config)# crypto key generate rsa. How many bits in the modulus 512: 1024% Generating 1024 bit RSA keys, keys will be non-exportableOK Set the size of key to 1024 bits. If your Cisco Switch is running an older version of Cisco IOS image, then it is extremely recommended that you upgrade to latest Cisco IOS. The crypto command can be used in order to generate a key pair which will have a private and public RSA key. Based on the given choices, the right answer to this question is C because you can get a key pair whenever this command is used.
KB ID 0000173
Problem
- We need configure SSH on a Cisco router or switch in order to access it remotely, unless we’re using an access server. (config)# crypto key generate rsa modulus 1024 label C1801 The name for the keys will be: C1801% The key modulus size is 1024 bits% Generating 1024 bit RSA. Most people believe that the ip domain-name command is.
- Mar 30, 2020 I have set DNS domain name with “IP domain-name” command. Then configure the router to use RSA key pair with modulus size of 1024 bites for remote service authentication with “crypto key generate rsa ” command. Add username “Admin” with Password of “Technig” for ssh authentication. Enabled ssh with “line vty 0 4” command.
Quite a while ago I wrote the “Connecting to and managing Cisco firewalls” article, which is still pretty complete, but I’ve been asked on a few occasions, “How do I actually configure the firewall to allow remote administration via, SSH, or HTTPS/ASDM, or Telnet
If you have no network connection to the firewall, then you will need to connect via console cable (CLICK HERE). Advanced system optimizer 3.9 registration key generator.
Solution
Cisco ASA Allow SSH – Via Command Line
1. Log on to the firewall > Go to enable mode > Go to configure terminal mode.
2. Now you can either allow access for one machine, or a whole network, the syntax is “ssh {ip address} {subnet mask} {interface that you will be connecting to}.
3. You will need to create a username and password for SSH access, then set SSH to use the LOCAL database to check of usernames and passwords, (unless you are using LDAP, RADIUS, TACACS, or Kerberos for authentication.)
4. By default the SSH session times out after 5 mins, I prefer to change this to 45 minutes.
5. To encrypt the SSH access you need to have an RSA keypair on the firewall, (Note: this is generated from the firewall’s host name, and its domain name, if you ever change either, the keypair will break, and SSH access will cease until the keypair is re-created). To create a key issue a “crypto key generate rsa” command;
Note: I set the key size to 2048, this is considered good practice
7. Lastly, save the changes with a “write mem” command;
Cisco ASA Allow SSH – Via ASDM (version shown 6.4(7))
1. Connect via ASDM > Navigate to Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH > Add > Select SSH > Supply the IP and subnet > OK. (Note you can set both the timeout, and the SSH versions you will accept, on this page also). Note you still need to generate the RSA Key (See step 5 above, good luck finding that in the ASDM – see the following article).
Cisco ASA – Enable AAA for SSH (Local Database) ASDM version 6.4(7)
Cisco ASA – Add a User to the Local Database
Cisco ASA – Allow HTTPS/ASDM – Via Command Line
1. Log on to the firewall > Go to enable mode > Go to configure terminal mode.
2. Now you can either allow access for one machine or a whole network, the syntax is “http {ip address} {subnet mask} {interface that it’s connected to}.
3. Unlike telnet and SSH, HTTPS/ADSM access is via the firewalls enable password (Unless you have enabled AAA logon). this password is set with the “enable password {password}” command. (Note: You will already have entered this password in step 1, only do this if you wish to change it).
4. You need to make sure that HTTPS access is enabled with a “http server enable” command.
5. Lastly, save the changes with a “write mem” command.
Cisco ASA – Allow HTTPS/ASDM – Via ASDM (version shown 6.4(7))
OK, the title of this might raise an eyebrow, but if you have access to the ASDM and you want to grant access to another IP/Network them you might want to do this. Connect via ASDM > Navigate to Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH > Add > Select ASDM/HTTPS > Supply the IP and subnet > OK. (Note: You can also enable and disable the http Server here and change its port number).
Cisco ASA Allow Telnet – Via Command Line
WARNING: Telenet is insecure, if possible don’t use it, (usernames and password are sent unencrypted.)
1. Log on to the firewall > Go to enable mode > Go to configure terminal mode.
2. Now you can either allow access for one machine, or a whole network, the syntax is “telnet {ip address} {subnet mask} {interface that its connected to}.
3. To set the password you use the “passwd” command (yes that’s spelled correctly).
4. By default the telnet session times out after 5 mins, I prefer to change this to 45 minutes.
5. Lastly, save the changes with a “write mem” command.
Allow Telnet – Via ASDM (version shown 6.4(7))
1. Connect via ASDM > Navigate to Configuration > Device Management > Management Access > ASDM/HTTPS/Telnet/SSH > Add > Select Telnet > Supply the IP and subnet > OK. (Note you can set the timeout on this page also).
Related Articles, References, Credits, or External Links
Original Article Written 30/01/11
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
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.
Generate Rsa Key Command
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.
Cisco Rsa Key Generation Command Code
Cisco Rsa Key Generation
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