Command To Generate Ssh Key On Cisco Router
- Command To Generate Ssh Key On Cisco Router Password
- Generate Ssh Key Windows
- Command To Generate Ssh Key On Cisco Router Password
- Generate Ssh Key Github
- Generate Ssh Key Putty
- October 2, 2015
- Posted by: Syed Shujaat
- Category: Cisco, Networking Solutions
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.
Nov 17, 2016 hello everyone. Today I will show you how to login Cisco router using ssh key. We will enable ssh on the router and then generate a key on an Ubuntu Linux server and using that key we will login to our router. The process is easy, lets start. Change the hostname of the router. Follow the below procedure to change the hostname of the router.
- 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.
- Use this command to generate RSA key pairs for your Cisco device (such as a router). RSA 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.
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.
NOTE: Before issuing this command, ensure that your router has a hostname and IP domain name configured (with the hostname and ipdomain-name commands).
You will be unable to complete the cryptokeygeneratersacommand without a hostname and IP domain name. (This situation is not true when you generate only a named key pair.)
Here are the steps to Enable SSH and Crypto Key setup : 2 config must requried for SSH
1 Setup Local VTY line User ID and password
router (Config) # Line VTY 0 15
router (Config-line)# login local
router (Config-line)# Exit
!!! create local login ID/Pass
router (Config)# username [loginid] password [cisco]
router (Config)# username loginid1 password cisco1
2. router (Config)# ip domain-name example.com
router (Config)# crypto key generate rsa
how many bits in the modulus [512] :1024
router (Config)# ip ssh version2
router (Config)# CTRL Z
Note | Secure Shell (SSH) may generate an additional RSA key pair if you generate a key pair on a router having no RSA keys. The additional key pair is used only by SSH and will have a name such as {router_FQDN }.server. For example, if a router name is “router1.cisco.com,” the key name is “router1.cisco.com.server.” |
This command is not saved in the router configuration; however, the RSA keys generated by this command are saved in the private configuration in NVRAM (which is never displayed to the user or backed up to another device) the next time the configuration is written to NVRAM.
Modulus Length
When you generate RSA keys, you will be prompted to enter a modulus length. The longer the modulus, the stronger the security. However, a longer modules take longer to generate (see the table below for sample times) and takes longer to use.
The size of Key Modulus range from 360 to 2048. Choosing modulus greater than 512 will take longer time.
| Router | 360 bits | 512 bits | 1024 bits | 2048 bits (maximum) |
|---|---|---|---|---|
| Cisco 2500 | 11 seconds | 20 seconds | 4 minutes, 38 seconds | More than 1 hour |
| Cisco 4700 | Less than 1 second | 1 second | 4 seconds | 50 seconds |
Cisco IOS software does not support a modulus greater than 4096 bits. A length of less than 512 bits is normally not recommended. In certain situations, the shorter modulus may not function properly with IKE, so we recommend using a minimum modulus of 2048 bits.
Syntax Description : Optional Strings to embed with SSH Crypto key
| general-keys | (Optional) Specifies that a general-purpose key pair will be generated, which is the default. | ||
| usage-keys | (Optional) Specifies that two RSA special-usage key pairs, one encryption pair and one signature pair, will be generated. | ||
| signature | (Optional) Specifies that the RSA public key generated will be a signature special usage key. | ||
| encryption | (Optional) Specifies that the RSA public key generated will be an encryption special usage key. | ||
| labelkey-label | (Optional) Specifies the name that is used for an RSA key pair when they are being exported.If a key label is not specified, the fully qualified domain name (FQDN) of the router is used. | ||
| exportable | (Optional) Specifies that the RSA key pair can be exported to another Cisco device, such as a router. | ||
| modulusmodulus-size | (Optional) Specifies the IP size of the key modulus.By default, the modulus of a certification authority (CA) key is 1024 bits. The recommended modulus for a CA key is 2048 bits. The range of a CA key modulus is from 350 to 4096 bits.
| ||
| storagedevicename: | (Optional) Specifies the key storage location. The name of the storage device is followed by a colon (:). | ||
| redundancy | (Optional) Specifies that the key should be synchronized to the standby CA. | ||
| ondevicename: | (Optional) Specifies that the RSA key pair will be created on the specified device, including a Universal Serial Bus (USB) token, local disk, or NVRAM. The name of the device is followed by a colon (:).Keys created on a USB token must be 2048 bits or less. |
| Command | Description |
|---|---|
| copy | Copies any file from a source to a destination, use the copy command in privileged EXEC mode. |
| cryptokeystorage | Sets the default storage location for RSA key pairs. |
| debugcryptoengine | Displays debug messages about crypto engines. |
| hostname | Specifies or modifies the hostname for the network server. |
| ipdomain-name | Defines a default domain name to complete unqualified hostnames (names without a dotted-decimal domain name). |
| showcryptokeymypubkeyrsa | Displays the RSA public keys of your router. |
| show crypto pki certificates | Displays information about your PKI certificate, certification authority, and any registration authority certificates. |
Cisco Ios Ssh
Command To Generate Ssh Key On Cisco Router Password
The Cisco IOS implementation of SSH (which has been available for several years now), called Cisco IOS SSH (available in S, E, and T trains of Cisco IOS software), is a service feature that is available in the service provider Cisco IOS revision levels. Cisco IOS SSH is used to ensure that remote devices are managed securely; Telnet is a very insecure protocol, because all segments are sent in clear text. Cisco IOS SSH allows an administrator to remotely manage a Cisco IOS device, such as a router or Catalyst operating system (CatOS), securely. Cisco IOS SSH provides a secure link between a client and server.
SSH uses the Rivest, Shamir, and Adelman (RSA) public key cryptography, therefore allowing a secure communication channel between a client and router.
SSH was introduced into Cisco IOS platforms/images as follows:.
■ SSHv1 server support was introduced in some Cisco IOS platforms/images starting in 12.0.5.S.
Generate Ssh Key Windows
■ SSH client support was introduced in some Cisco IOS platforms/images starting in 12.1.(5)T9.
■ SSH terminal-line access (also known as reverse-Telnet) was introduced in some Cisco IOS platforms/images starting in 12.2.2.T. It can be used to secure reverse-telnet connections from terminal servers.
■ SSHv2 support was introduced in some Cisco IOS platforms/images starting in 12.1(19)E6.
The following is an example of configuring a Cisco router as an SSH server and a client connection from another Cisco IOS router.
There are four steps required to enable SSH support on a Cisco IOS router:
Command To Generate Ssh Key On Cisco Router Password
1. Configure the hostname command.
2. Configure the DNS domain.
3. Generate the public (RSA) key to be used.
4. Enable SSH transport support for the vtys (optional step).
Example 2-12 displays a sample Cisco IOS SSH configuration. The exclamation points (!) identify comments that have been added to make the configuration more reader-friendly.
Example 2-12 Cisco IOS SSH Server
!Configure the hostname if not previously done so. hostname Massimo
! configure a local username and password to authenticate ! the remote SSH user, AAA can ! also be used username cisco password 0 cisco !Configure the router's DNS domain, ip domain-name cisco.com Interface Ethernet0 ip address 10.1.1.1 255.255.255.0
! Generate RSA key, completed from the configuration mode in IOS. crypto key generate rsa
! Following are optional SSH commands that control parameters on your route ip ssh time-out 120
ip ssh authentication-retries 2
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!By default the vtys1 transport is all available such as Telnet. ! In this case, only SSH will be used.
line vty 0 4 login local transport input SSH end
Example 2-12 configures a router named Massimo for Cisco IOS SSH. In particular, the command crypto key generate rsa generates the RSA public key, the ip ssh time-out 120 command sets the default idle time to 120, and the ip ssh authentication-retries 2 command sets a maximum retry limit of 2. The crypto key generate command builds both halves of the key pair. There is an optional write keyword that saves the key pair to NVRAM; otherwise, it is lost on reboot or a reload as the volatile RAM is refreshed.
To start an encrypted session with a remote networking device, use the ssh user EXEC command:
ssh [-l userid] [-c {des 3des}] [-o numberofpasswordprompts n] [-p portnum] {ipaddr hostname} [command]
-l userid | (Optional) Specifies the user ID to use when logging into the remote networking device running the SSH server. If no user ID is specified, one needs to be defined. Otherwise, the following error appears on the router's CLI: % No user specified nor available for SSH client |
-c { des 3des } | (Optional) Specifies the crypto algorithm, DES or 3DES, to use for encrypting data. To use SSH, you must have an encryption image running on the router. Cisco software images that include encryption have the designators 'k8' (DES) or 'k9' (3DES). |
-o numberofpasswdprompts n | (Optional) Specifies the number of password prompts that the software generates before ending the session. The SSH server may also apply a limit to the number of attempts. If the limit set by the server is less than the value specified by the -o numberofpasswdprompts keyword, the limit set by the server takes precedence. The default is 3 attempts, which is also the Cisco IOS SSH server default. The range of values is from 1 to 5. You care about precomputation and dictionary attacks. You assume a password like puppies. $endgroup$–Jun 1 '18 at 18:43. There is something off in your setup:. Generate ecdh key in browser. So my proposal is better in some important cases, and no worse in any case. |
-p portnum | (Optional) Indicates the desired port number for the remote host. The default port number is 22. |
ipaddr hostname | Specifies the IP address or host name of the remote networking device. |
command | (Optional) Specifies the Cisco IOS command that you want to run on the remote networking device. If the remote host is not running Cisco IOS software, this may be any command recognized by the remote host. If the command includes spaces, you must enclose the command in quotation marks. |
*From http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_r/fothercr/ srfssh.htm#wp1024082.
*From http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fsecur_r/fothercr/ srfssh.htm#wp1024082.
The following is sample output from the show ip ssh command: Router# show ip ssh
Connection Version Encryption State Username 0 2.0 3DES 4 guest
The connection is labeled 0 (vty number), is running version 2.0, is using 3DES encryption, and the username is guest.
Example 2-13 displays a session connection from a router named Simon to the SSH server-enabled router named Massimo.
Example 2-13 SSH Connection Example
Simon#ssh -c 3des -l cisco 10.1.1.1 Trying 10.1.1.1..Open Password:cisco Massimo>
The username is defined with the -l option; in Example 2-13, it is set to cisco.
To display the version and configuration data for SSH, use the show ip ssh privileged EXEC command.
For more detailed information on SSH and on the Cisco IOS functional matrix, visit http:// www.ssh.com/products/tectia/ and http://www.cisco.com/warp/public/707/ssh.shtml, respectively.
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