Operation Manual – SSH
H3C S3100 Series Ethernet Switches Chapter 1 SSH Configuration
1-1
Chapter 1 SSH Configuration
When configuring SSH, go to these sections for information you are interested:
z SSH Overview
z SSH Server and Client Configuration Task List
z Displaying and Maintaining SSH Configuration
z Comparison of SSH Commands with the Same Functions
z SSH Configuration Examples
1.1 SSH Overview
1.1.1 Introduction to SSH
Secure Shell (SSH) is a protocol that provides secure remote login and other security
services in insecure network environments. In an SSH connection, data are encrypted
before being sent out and decrypted after they reach the destination. This prevents
attacks such as plain text password interception. Besides, SSH also provides powerful
user authentication functions that prevent attacks such as DNS and IP spoofing.
SSH adopts the client-server model. The device can be configured as an SSH client or
an SSH server. In the former case, the device establishes a remote SSH connection to
an SSH server. In the latter case, the device provides connections to multiple clients.
Furthermore, SSH can also provide data compression to increase transmission speed,
take the place of Telnet or provide a secure “channel” for FTP.
Caution:
z Currently, when functioning as an SSH server, an S3100-EI switch supports SSH2
and SSH1, while an S3100-SI switch supports only SSH2.
z When functioning as an SSH client, an S3100 switch supports only SSH2.
z Unless otherwise noted, SSH refers to SSH2 throughout this document.
1.1.2 Algorithm and Key
Algorithm is a set of transformation rules for encryption and decryption. Information
without being encrypted is known as plain text, while information that is encrypted is
known as cipher text. Encryption and decryption are performed using a string of
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