SSH (Secure Shell) provides secure management of network devices. How to Enable SSH in Cisco Router with Packet Tracer By using SSH, you establish a secure connection to a network device that you access, and your data is sent in encrypted form. SSH is a much safer protocol than the Telnet protocol and uses the TCP 22 port by default. There are 2 versions of the SSH protocol. Use voice encryption Message Verification Code (MAC) algorithms for integrity checking.SSH V2, this release has an advanced key exchange algorithm that is not vulnerable to the same abuse and includes more powerful and comprehensive features: SSH V1 exploits several patented encryption algorithms and is vulnerable to a well-known vulnerability that could allow an attacker to enter data into the communication flow. We recommend that you use SSH V2 as far as possible to remotely manage network devices. To enable SSH in the real scenario, make sure that the file name of your Cisco IOS software is k9 (crypto).įirst, run Packet Tracer and then create a network topology as shown in the image below. Add an additional Router to the workspace, because after configuration we will connect the Router to the Router with SSH. Open the CLI prompt by clicking on the SYSNETTECH Router and press Enter to skip the initial configuration. To enable SSH on the router, perform the following commands in order. ssh-keygen is able to generate a key using one of three different digital signature algorithms. ssh-keygen comes installed with SSH in most of the operating systems. %LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up SYSNETTECH(config)#interface gigabitethernet 0/0 Router>enableĮnter configuration commands, one per line. ssh-keygen is the utility used to generate, manage, and convert authentication keys for SSH. Choosing a key modulus greater than 512 may take The name for the keys will be: Ĭhoose the size of the key modulus in the range of 360 to 2048 for your SYSNETTECH(config)#crypto key generate rsa %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up % Generating 1024 bit RSA keys, keys will be non-exportable. SYSNETTECH(config-line)#transport input ssh SYSNETTECH(config-line)#privilege level 15 SYSNETTECH(config)#ip ssh authentication-retries 3 SYSNETTECH(config)#username cisco privilege 15 password cisco123Ĭonfigure the IP settings of PC1 as follows.
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