OpenSSH (Secure Shell) Server and Client Configuration - RHCSA

1. A cryptographic handshake is made so that the client can verify that it is communicating with the correct server.

2. The transport layer of the connection between the client and remote host is encrypted using a symmetric cipher.

3. The client authenticates itself to the server.

4. The client interacts with the remote host over the encrypted connection.



openssh-server package installed

X11 forwarding

ssh -Y username@hostname





ssh -L local-port:remote-hostname:remote-port username@hostname



sshd(8) — The manual page for the sshd daemon documents available command line options and provides a complete list of supported configuration files and directories.

ssh(1) — The manual page for the ssh client application provides a complete list of available command line options and supported configuration files and directories.

scp(1) — The manual page for the scp utility provides a more detailed description of this utility and its usage.

sftp(1) — The manual page for the sftp utility.

ssh-keygen(1) — The manual page for the ssh-keygen utility documents in detail how to use it to generate, manage, and convert authentication keys used by ssh.

ssh_config(5) — The manual page named ssh_config documents available SSH client configuration options.

sshd_config(5) — The manual page named sshd_config provides a full description of available SSH daemon configuration options.



SSH (Secure Shell) is a protocol which facilitates secure communications between two systems using a client-server architecture and allows users to log in to server host systems remotely. Unlike other remote communication protocols, such as FTP or Telnet, SSH encrypts the login session, rendering the connection difficult for intruders to collect unencrypted passwords.



The ssh program is designed to replace older, less secure terminal applications used to log in to remote hosts, such as telnet or rsh. A related program called scp replaces older programs designed to copy files between hosts, such as rcp. Because these older applications do not encrypt passwords transmitted between the client and the server, avoid them whenever possible. Using secure methods to log in to remote systems decreases the risks for both the client system and the remote host.

Red Hat Enterprise Linux includes the general OpenSSH package, openssh, as well as the OpenSSH

server, openssh-server, and client, openssh-clients, packages. Note, the OpenSSH packages require the

OpenSSL package openssl-libs, which installs several important cryptographic libraries, enabling

OpenSSH to provide encrypted communications.



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