Crypto Key Generate Rsa Label Ssh Modulus 1024
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End with CNTL/Z. Router1(config)#crypto key generate rsa The name for the keys will be: Router1.oreilly.com Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes. How many bits in the modulus 512: 1024 Generating RSA keys. Step 4: Erase existing key pairs on the router. The router uses the RSA key pair for authentication and encryption of transmitted SSH data. Configure the RSA keys with 1024 for the number of modulus bits. The default is 512, and the range is from 360 to 2048. R3(config) # crypto key generate rsa general-keys modulus 1024 The name.
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Generates the crypto key to enable SSH.
Syntax
ASA5510, Can't generate RSA keys, so can't SSH: Any ideas? ASAXXX(config)# crypto key generate rsa general-keys modulus 1024 INFO: The name for the keys will be: Keypair generation process begin. ASA(config)#crypto key generate rsa label cisco modulus 1024. With this command we create crypto keys on asa, naming it 'cisco' and also defining key size with modulus '1024'. ASA(config)#ssh 0 0 inside. With this command we define from inside of ASA traffic of ssh will be initiated and with 0 0 we define any ip address and any subnet mask. 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. We have provided a password for vty line login and at last we have created key of 1024 bytes and labelled it as Cisco. Note – The last command “crypto key generate rsa label Cisco modulus 1024” will be executed only if your router supports security features like. Solved: Hello, I am trying to change the key for SSH from 1024 to 2048 but I have (so far) no solution for that. Unfortunately, ip ssh rsa keypair-name SSH and crypto key generate rsa general-keys modulus 2048 label SSH don't work. I trying also.
Syntax
Command Default
A crypto key is not generated and SSH is not enabled.
Parameters
- dsa
- Generates the DSA host key pair.
- rsa
- Generates the RSA host key pair.
- moduluskey-size
- Specifies the modulus size of the RSA key pair, in bits. The valid values for the modulus size are 1024 or 2048. The default value is 1024.
Usage Guidelines
The dsa keyword is optional. If you do not enter the dsa keyword, the crypto key generate command generates a DSA key pair by default.
To enable SSH, you generate a DSA or RSA host key on the device. The SSH server on the ICX device uses this host DSA or RSA key, along with a dynamically generated server DSA or RSA key pair, to negotiate a session key and encryption method with the client trying to connect to it. While the SSH listener exists at all times, sessions cannot be started from clients until a host key is generated. After a host key is generated, clients can start sessions. When a host key is generated, it is saved to the flash memory of all management modules. The time to initially generate SSH keys varies depending on the configuration, and can be from a under a minute to several minutes.
To disable SSH, you delete all of the host keys from the device. When a host key is deleted, it is deleted from the flash memory of all management modules.
An RSA key with modulus 2048 must be used in FIPS or Common Criteria mode.
Examples
The following example shows how to generate the DSA host key pair.
The following example shows how to generate the RSA key pair.
Packet Tracer – Configure Secure Passwords and SSH Instructor Version
Addressing Table
| Device | Interface | IP Address | Subnet Mask | Default Gateway |
|---|---|---|---|---|
| RTA | G0/0 | 172.16.1.1 | 255.255.255.0 | N/A |
| PCA | NIC | 172.16.1.10 | 255.255.255.0 | 172.16.1.1 |
| SW1 | VLAN 1 | 172.16.1.2 | 255.255.255.0 | 172.16.1.1 |
Scenario
Generate random number php. The network administrator has asked you to prepare RTA and SW1 for deployment. Before they can be connected to the network, security measures must be enabled.
Intructions
Step 1: Configure Basic Security on the Router
a. Configure IP addressing on PCA according to the Addressing Table.
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b. Console into RTA from the Terminal on PCA.
c. Configure the hostname as RTA.
d. Configure IP addressing on RTA and enable the interface.
e. Encrypt all plaintext passwords.
f. Set the minimum password length to 10.
g. Set a strong secret password of your choosing.
Note: Choose a password that you will remember, or you will need to reset the activity if you are locked out of the device.
h. Disable DNS lookup.
i. Set the domain name to CCNA.com (case-sensitive for scoring in PT).
j. Create a user of your choosing with a strong encrypted password.
k. Generate 1024-bit RSA keys.
Note: In Packet Tracer, enter the crypto key generate rsa command and press Enter to continue.
l. Block anyone for three minutes who fails to log in after four attempts within a two-minute period.
m. Configure all VTY lines for SSH access and use the local user profiles for authentication.
n. Set the EXEC mode timeout to 6 minutes on the VTY lines.
o. Save the configuration to NVRAM.
p. Access the command prompt on the desktop of PCA to establish an SSH connection to RTA.
Step 2: Configure Basic Security on the Switch
Configure switch SW1 with corresponding security measures. Refer to the configuration steps on the router if you need additional assistance.
a. Click on SW1 and select the CLI tab.
b. Configure the hostname as SW1.
c. Configure IP addressing on SW1 VLAN1 and enable the interface.
d. Configure the default gateway address.
e. Disable all unused switch ports.
Note: On a switch it is a good security practice to disable unused ports. One method of doing this is to simply shut down each port with the ‘shutdown’ command. This would require accessing each port individually. There is a shortcut method for making modifications to several ports at once by using the interface range command. On SW1 all ports except FastEthernet0/1 and GigabitEthernet0/1 can be shutdown with the following command:
The command used the port range of 2-24 for the FastEthernet ports and then a single port range of GigabitEthernet0/2.
f. Encrypt all plaintext passwords.
g. Set a strong secret password of your choosing.
h. Disable DNS lookup.
i. Set the domain name to CCNA.com (case-sensitive for scoring in PT).
j. Create a user of your choosing with a strong encrypted password.
k. Generate 1024-bit RSA keys.
l. Configure all VTY lines for SSH access and use the local user profiles for authentication.
m. Set the EXEC mode timeout to 6 minutes on all VTY lines.
n. Save the configuration to NVRAM.