Talking about the SSH1 under Linux, SSH2

Ssh:secure Shell. is a security protocol.
A common application scenario is a remote console login.
SSH1FreeSSH2Charges.
In factSshNot just used under Linux and Unix, they are alsoWidely used under Windows NT.
Relative toTelnet,ssh encrypts and compresses the transmitted content.

The SSH package consists of a server-side package and a customer package, and the server package under Windows can only be run in versions above Windows NT and Windows Server, with no restrictions on the client.
UNIX, Linux systems are basically with the SSH Server package and client package, or you can use Yum to install, after the system installation is complete, the default ssh is open, so please modify the default port number in /etc/ssh/sshd_ Config can be modified inside. Then test with putty or securecrt.
If you want to use SSH2 and don't want to pay, then an optional free software is OpenSSH, which is a software package that complies with the GPL, and supports SSH1 and SSH2 standards, which can be downloaded from www.openssh.com.

from: http://blog.csdn.net/cnmm22/article/details/44887763

Talking about the SSH1 under Linux, SSH2