ZyXEL Communications 91-009-073003B ユーザーズマニュアル

 Chapter 2 Features and Applications

ZyWALL USG 50 User’s Guide

With the anti-virus packet scanner, your ZyWALL scans files transmitting through 
the enabled interfaces into the network. The ZyWALL helps stop threats at the 
network edge before they reach the local host computers.

The anti-spam feature can mark or discard spam. Use the white list to identify 
legitimate e-mail. Use the black list to identify spam e-mail. The ZyWALL can also 
check e-mail against a DNS black list (DNSBL) of IP addresses of servers that are 
suspected of being used by spammers.

Application patrol (App. Patrol) manages instant messenger (IM), peer-to-peer 
(P2P) applications like MSN and BitTorrent. You can even control the use of a 
particular application’s individual features (like text messaging, voice, video 
conferencing, and file transfers). Application patrol has powerful bandwidth 
management including traffic prioritization to enhance the performance of delay-
sensitive applications like voice and video. You can also use an option that gives 
SIP priority over all other traffic. This maximizes SIP traffic throughput for 
improved VoIP call sound quality.

These are some example applications for your ZyWALL. See also 

 for configuration tutorial examples.