- Generate Rsa Key Command
- Cisco Asa Crypto Key Generate Rsa Command Download
- Cisco Asa Crypto Key Generate Rsa Command Download
- Cisco Switch Can't Generate Crypto Key Rsa
- Cisco Asa Crypto Key Generate Rsa Command List
Oct 02, 2015 SSH Config and crypto key generate RSA command. Use this command to generate RSA key pairs for your Cisco device (such as a router). Keys are generated in pairs–one public RSA key and one private RSA key. If your router already has RSA keys when you issue this command, you will be warned and prompted to replace the existing keys with new keys. Show crypto key mypubkey rsa: Shows information about the SSL certificate If you’d like to learn more about on how to configure SSH on a Cisco router I recommend you read through this documentation: Configuring Secure Shell on Routers and Switches Running Cisco IOS.
- 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. 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.
- Sep 12, 2019 Symptom: After applying command crypto key generate rsa modulus 4096 causes ASA failover ASA will not generate key 4096 Conditions: Restrictive polltime (non defailut is configured) as per example failover polltime unit msec 200 holdtime msec 800 failover polltime interface msec 750 holdtime 5 ASA runs software 9.4 or 9.5.
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.
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.
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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Remote Management Access to ASA and FWSM
The examples presented so far have considered that there was physical access to the console port of the appliance (or to the hosting Catalyst 6500 for the FWSM). This section examines management connections that rely on remote access protocols (Telnet, SSH, and HTTPS).
Telnet Access
Telnet is a classic terminal access protocol that has received much criticism because of its clear text nature. It is highly recommended you replace it with SSH, which provides confidentiality.
Generate Rsa Key Command
At any rate, Telnet can still be useful for testing purposes mainly during initial setup. The commands shown in Example 3-15 specify the following:
- Telnet access is accepted only when it is initiated from source addresses on network 192.168.1.0/24. Further, the packets must arrive through the logical interface called mgmt.
- The authentication of users who have permission to Telnet to the firewall is done using the LOCAL database. (LOCAL is a reserved keyword for ASA and FWSM.)
- The username admin is included in the LOCAL database.
Example 3-15 also displays a sample Telnet session coming from address 192.168.1.201.
Example 3-15. Configuring and Verifying Telnet Access
SSH Access
If remote CLI access to the firewalls is needed, SSH is the protocol of choice. It provides the same terminal services that Telnet does but with the significant advantage of encrypting traffic between client and server (the firewall receiving the connection).
Because SSH uses RSA public keys to encrypt the sessions, you need to have consistent timing information. Example 3-16 shows not only how to manually adjust and verify timing information, but also how to create a domain name and generate RSA keys.
Example 3-17 shows how to visualize SSH-related information in the Running-config. Notice that the default timeout value for SSH sessions is 5 minutes.
Example 3-16. Recommended Tasks Before Starting SSH Configuration
Example 3-17. SSH Configuration
HTTPS Access Using ASDM
The Adaptive Security Device Manager (ASDM) is an intuitive and easy-to-use GUI that accompanies every member of the ASA family. The interface provides a nice graphical abstraction for the actual commands that are used not only to implement the features but also to verify their operation, thus allowing users who are already familiar with classic firewall concepts (even from other vendors) to easily adapt their knowledge to the new GUI and immediately start working.
Documenting ASDM usage with its uncountable configuration and monitoring screens is beyond the scope of this book. However, the preparation of firewall devices to accommodate ASDM management is covered.
ASDM uses the HTTPS protocol for communications between the management station and the firewall. After properly loading the ASDM image on the device's flash memory, a web browser can be employed for the first access to the device, with the underlying goal of installing the ASDM launcher application on the administrator's PC.
Example 3-18 shows the preliminary tasks for enabling HTTPS access and assumes that the remote user has been granted the highest privilege level (priv-lvl = 15) and that the requests arrive though the logical interface called mgmt. In the example, the user named admin is authenticated against the LOCAL database and should start the management session from a host that belongs to the 192.168.1.0/24 subnet. The example also contains information about location of the ASDM image in the device flash (disk0: in this case) and how to find it within the show version output.
Example 3-18. Enabling HTTPS Access on ASA
Figure 3-4 portrays the web browser access to the HTPPS server on the device whose management interface is configured with the address 192.168.1.2 (https://192.168.1.2).
Figure 3-4 First HTTPS Access and Initial ASDM Page
Cisco Asa Crypto Key Generate Rsa Command Download
From this screen, select the Install ASDM Launcher and Run ASDM option and follow these steps:
Cisco Asa Crypto Key Generate Rsa Command Download
- Step 1. Authenticate with the credentials configured in Example 3-18 when the Connect to 192.168.1.2 window displays.
- Step 2. From the File Download - Security Warning window, save the '.msi' file locally.
- Step 3. Run the '.msi' file and install the ASDM Launcher application.
- Step 4. After starting the ASDM Launcher, fill in the IP address (192.168.1.2 in this case) and the credentials (username/password).
- Step 5. After accepting the device certificate, the main ASDM page displays (Figure 3-5). This screen summarizes information for the device, including available licenses, interface status, and system resources status.
Figure 3-6 depicts the base ASDM screen for Interface Configuration on an ASA 5505 appliance. Notice that the full path to this particular screen, Configuration > Device Setup> Interfaces, displays on the top of the right pane.
Cisco Switch Can't Generate Crypto Key Rsa
Figure 3-6 Base ASDM Page for Interface Configuration
Figure 3-7 shows a sample ASDM screen that helps perform the Monitoring task of verifying the ARP table. The complete path for viewing this table is represented at the top of the right pane (Monitoring > Interfaces > ARP Table).
Cisco Asa Crypto Key Generate Rsa Command List
Figure 3-7 Base ASDM Page for ARP Table Monitoring