A, SSH Overview
1 , Introduction to SSH
SSH (SecureShell) is a secure channel protocol, mainly used for remote login, remote copy characters such as interface features. SSH protocol for communication data transmission between the two sides has been encrypted, including user passwords entered when the user logs on, the language TELNET (remote login) compared to other applications, SSH protocol offers better security.
1, the default listening port: TCP22
Two, OpenSSH configuration
. 1 , the OpenSSH installation package
Automatically installed Linux system default installation, if not installed, the installation package rpm disc follows:
openssh-5.3p1-94.el6.x86_64.rpm
openssh-askpass-5.3p1-94.el6.x86_64.rpm
openssh-clients-5.3p1-94.el6.x86_64.rpm
openssh-server-5.3p1-94.el6.x86_64.rpm
• Service Name: sshd
· Main server: / usr / sbin / sshd
· Server configuration file: / etc / ssh / sshd_config
· Client configuration file: / etc / ssh / ssh_config
2, the server OpenSSH configuration