Ssh Packet

Posted : admin On 1/2/2022

Configure the SSH Server on Router

  1. Ssh Packet Type
  2. Ssh Packet Tracer

In this task, you use the CLI to configure the router to be managed securely using SSH instead of Telnet. Secure Shell (SSH) is a network protocol that establishes a secure terminal emulation connection to a router or other networking device. SSH encrypts all information that passes over the network link and provides authentication of the remote computer. SSH is rapidly replacing Telnet as the remote login tool of choice for network professionals.

Debug3: send packet: type 50 debug2: we sent a password packet, wait for reply debug3: receive packet: type 1 Received disconnect from port 22:11: unix ssh. Ssh/iddsa debug2: we did not send a packet, disable method debug3: authmethodlookup password debug3: remaining preferred:,password debug3. I have access to the host via SSH and a Vesta Control Panel. But whenever I try to SSH into the host, I get to the login screen, and after entering the correct password, I get the following error: packetwritewait: Connection to 123.456.789.10 port 22: Broken pipe. I tried changing the settings in /etc/ssh/ssh to set the timeout to 120 and the. Hi everyone i am setting up a lab on cisco packet tracer to create an access via ssh. I created both a dns server (from which the encryption keys will be generated via ssh), two PCs and a switch in the center. On the switch I configured the vlan 1 (the only vlan), with ip while the dns s. In this activity, we will use a list of requirements to configure the New switch with initial settings, SSH, and port security.


Step 1: Configure a domain name.

Enter global configuration mode and set the domain name.

R1#conf t

R1(config)#ip domain-name

Ssh Packet Type

Step 2: Configure a privileged user for login from the SSH client.

  1. Use the username command to create the user ID with the highest possible privilege level and a secret password.

Ssh Packet Tracer

R1(config)#username admin privilege 15 secret cisco12345

  1. Exit to the initial router login screen, and log in with this username. What was the router prompt after you entered the password? The privileged EXEC (enable) prompt # sign. With a privilege level of 15, the login defaults to privileged EXEC mode.

Step 3: Configure the incoming vty lines.

Specify a privilege level of 15 so that a user with the highest privilege level (15) will default to privileged EXEC mode when accessing the vty lines. Other users will default to user EXEC mode. Use the local user accounts for mandatory login and validation, and accept only SSH connections.

R1(config)#line vty 0 4

SshWireshark decode ssh

R1(config-line)#transport input ssh

R1(config-line)#login local

Step 4: Erase existing key pairs on the router.

R1(config)#crypto key zeroize rsa

Ssh Packet

Note: If no keys exist, you might receive this message: % No Signature RSA Keys found in configuration.

Step 5: Generate the RSA encryption key pair for 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.

R1(config)#crypto key generate rsa


% The key modulus size is 1024 bits

% Generating 1024 bit RSA keys, keys will be non-exportable…[OK]


*Dec 16 21:24:16.175: %SSH-5-ENABLED: SSH 1.99 has been enabled

Note: The details of encryption methods are covered in Chapter 7.

Step 6: Verify the SSH configuration.

  1. Use the show ip ssh command to see the current settings.

R1#show ip ssh

  1. Fill in the following information based on the output of the show ip ssh command. SSH version enabled: Most likely 1.5 to 1.99

Authentication timeout: Default is 120 seconds

Authentication retries: Default is 3 tries

Step 7: Configure SSH timeouts and authentication parameters.

The default SSH timeouts and authentication parameters can be altered to be more restrictive using the following commands.

R1(config)#ip ssh time-out 90

R1(config)#ip ssh authentication-retries 2

Step 8: Save the running-config to the startup-config.

R1#copy running-config startup-config

To test ssh go to other router

R2#ssh -l admin

enter the password for admin that is cisco12345