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ssh-keygen: Generate and Manage SSH Key Pairs
ssh-keygen is a utility used to generate, manage, and convert OpenSSH authentication key pairs (public and private keys). It is a core tool for securely connecting to remote servers via SSH or authenticating with services like Git.
ssh-keyscan: Collect SSH Host Keys
A utility to collect the public host keys of SSH servers. The collected keys are added to the `~/.ssh/known_hosts` file, allowing SSH clients to verify the server's identity when connecting. This plays a crucial role in preventing Man-in-the-Middle attacks.
ssh-reset: Resetting for SSH Connection Troubleshooting
ssh-reset is a utility script or function used to diagnose and resolve SSH connection issues. It typically performs actions to revert SSH-related configurations to their initial state, such as restarting the SSH service, cleaning the `known_hosts` file, or resetting firewall rules. This command is not included by default in standard Linux distributions and may need to be created by the user or provided as part of a specific management tool.
SSH Server (sshd): Remote Access Management
SSH server is software that provides secure access to remote systems using the Secure Shell (SSH) protocol. It typically runs as a service named `sshd` (SSH Daemon) and enables remote command execution, file transfer (SCP/SFTP), and port forwarding through an encrypted communication channel. It is essential for various remote tasks such as system administration, development, and data transfer.
ssh-shell: Remote Shell Access
`ssh-shell` is a conceptual command for securely connecting to a remote server to obtain a shell environment. This is typically achieved through the `ssh` command, allowing users to execute commands and manage files on a remote system. This guide explains the general usage of the `ssh` command under the `ssh-shell` concept.
ssh-socks: Setting up a SOCKS Proxy
ssh-socks refers to the concept or script for establishing a local SOCKS proxy server through an SSH connection. This allows you to securely tunnel network traffic from your local applications via a remote server. It is commonly used for bypassing firewalls, enhancing security, and accessing specific network environments.
ssh-tunnel: Setting Up SSH Tunneling
SSH tunneling is a technique for forwarding network traffic through an encrypted SSH connection. This allows you to bypass firewalls or securely access services over an insecure network. 'ssh-tunnel' is not a separate command; it's typically implemented using the port forwarding capabilities of the 'ssh' command.
ssh-user: How to Specify SSH User
`ssh-user` is not an independent command; it represents the concept of specifying the user to connect as when using the `ssh` command to access a remote server. It typically corresponds to the `[username]` part in the format `ssh [username]@[hostname]`. This guide explains how to effectively specify and manage users through the `ssh` command.
sshd: OpenSSH Daemon
sshd is the OpenSSH server daemon, providing secure, encrypted communication for remote systems. It listens for connection requests from SSH clients, handles user authentication and session management, enabling features like remote logins, file transfers (SCP, SFTP), and port forwarding.
sshfs: Mount Remote File Systems via SSH
sshfs is a client that allows you to mount a directory from a remote server onto your local file system using the SSH File Transfer Protocol. This enables you to browse and edit remote files as if they were on a local disk. It operates based on FUSE (Filesystem in Userspace).
tcpdump: Network Traffic Dump and Analysis
tcpdump is a powerful command-line utility for capturing and analyzing TCP/IP and other packets transmitted over a network interface. It allows you to filter packets based on specific criteria, display them in real-time, or save them to a file for later analysis. It is widely used for network troubleshooting, security auditing, and application debugging.
Complete Guide to the Telnet Command
`telnet` is a network protocol and command that allows you to connect to a remote host, open a terminal session, and execute commands. Due to security vulnerabilities, it is primarily used to check if specific ports on network devices are open. SSH (Secure Shell) is the modern secure protocol that replaces telnet.