ZyXEL Communications ZyXEL Dimension ES-3124 - Manual (Page 139)

Dimension ES-3124 Ethernet Switch
Access Control 17-7
17.6 SSH Implementation on the ES-3124
Your ES-3124 supports SSH versions 1 and 2 using RSA and DSA authentication and five encryption methods
(AES, 3DES, RC4, Blowfish and CAST). The SSH server is implemented on the ES-3124 for remote SMT
management and file transfer on port 22 (by default). Up to four SSH connections are allowed at a time.
17.6.1 Requirements for Using SSH
You must install an SSH client program on a client computer (Windows or Linux operating system) that is used to
connect to the ES-3124 over SSH.
17.7 Introduction to HTTPS
HTTPS (HyperText Transfer Protocol over Secure Socket Layer, or HTTP over SSL) is a web protocol that
encrypts and decrypts web pages. Secure Socket Layer (SSL) is an application-level protocol that enables secure
transactions of data by ensuring confidentiality (an unauthorized party cannot read the transferred data),
authentication (one party can identify the other party) and data integrity (you know if data has been changed).
It relies upon certificates, public keys, and private keys.
HTTPS on the ES-3124 is used so that you may securely access the ES-3124 using the web configurator. The SSL
protocol specifies that the SSL server (the ES-3124) must always authenticate itself to the SSL client (the computer
which requests the HTTPS connection with the ES-3124), whereas the SSL client only should authenticate itself
when the SSL server requires it to do so.
Please refer to the following figure.
Step 1. HTTPS connection requests from an SSL-aware web browser go to port 443 (by default) on the ES-3124’s
WS (web server).
Step 2. HTTP connection requests from a web browser go to port 80 (by default) on the ES-3124’s WS (web
server).
Figure 17-8 HTTPS Implementation