And GnuPG asks kind of key. Select RSA and RSA. Please select what kind of key you want: (1) RSA and RSA (default) (2) DSA and Elgamal (3) DSA (sign only) (4) RSA (sign only) Your selection? 1 RSA keys may be between 1024 and 4096 bits long. And select 2048-bit (as Gnuk Token only suppurt this). What keysize do you want? (2048) Requested.

1. Crypto Key Generate Rsa Mod 2048 X
2. Crypto Key Generate Rsa Command
3. Crypto Key Generate Rsa Mod 2048 Free

KB ID 0000173

Problem

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).

• This document describes how I generate 2048-bit RSA keys. Here is the log to generate signature key and encryption subkey. I invoke GnuPG with -gen-key option.
• Oct 15, 2014  The ASA will retain all keys over a reboot as long as a 'write mem' is done after the keys are created. This applies to the 'RSA-Key' that is created by 'crypto key generate rsa' and the 'RSA-Key.server' key that is created upon the first ssh connection to the ASA.

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

Crypto Key Generate Rsa Mod 2048 X

• 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.

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

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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

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.

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

Crypto Key Generate Rsa Command

Crypto Key Generate Rsa Mod 2048 Free