ZyXEL Communications ONU-2024 Series, User Manual

Page: 211 / 268

Chapter 27 Access Control
ONU User’s Guide
211
27.6 SSH Implementation on the ONU
Your ONU supports SSH version 2 using RSA authentication and three encryption methods
(DES, 3DES and Blowfish). The SSH server is implemented on the ONU for remote
management and file transfer on port 22. Only one SSH connection is allowed at a time.
27.6.1 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 ONU over SSH.
27.7 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 ONU is used so that you may securely access the ONU using the web
configurator. When a computer requests an HTTPS (secure) connection, the ONU sends its
certificate to the computer. The user decides if he wants to trust the certificate. If the user
decides to trust the certificate, the certificate is used in building the HTTPS connection.
Please refer to the following figure.
1
HTTPS connection requests from an SSL-aware web browser go to port 443 (by default)
on the ONU’s WS (web server).
2
HTTP connection requests from a web browser go to port 80 (by default) on the ONU’s
WS (web server).
Figure 118 HTTPS Implementation