ZyXEL Communications P-870HW-51a v2 User Manual

Chapter 1 Introducing the ZyXEL Device

P-870HW-51a v2 User’s Guide

Do the following things regularly to make the ZyXEL Device more secure and to 
manage the ZyXEL Device more effectively.

• Change the password. Use a password that’s not easy to guess and that consists 

of different types of characters, such as numbers and letters.

• Write down the password and put it in a safe place.
• Back up the configuration (and make sure you know how to restore it). 

Restoring an earlier working configuration may be useful if the device becomes 

unstable or even crashes. If you forget your password, you will have to reset the 

ZyXEL Device to its factory default settings. If you backed up an earlier 

configuration file, you would not have to totally re-configure the ZyXEL Device. 

You could simply restore your last configuration.

Here are some example uses for which the ZyXEL Device is well suited.

Your ZyXEL Device provides shared Internet access by connecting the DSL port to 
the DSL or MODEM jack on a splitter or your telephone jack. Computers can 
connect to the ZyXEL Device’s LAN ports (or wirelessly).

Figure 1   ZyXEL Device’s Router Features

You can also configure IP filtering on the ZyXEL Device for secure Internet access. 
When the IP filter is on, all incoming traffic from the Internet to your network is 
blocked by default unless it is initiated from your network. This means that probes 
from the outside to your network are not allowed, but you can safely browse the 
Internet and download files.

Internet

DSL