ZyXEL Communications 200 Series User Manual

 Chapter 2 Features and Applications

ZyWALL USG 100/200 Series User’s Guide

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.

The following is the key used to describe the packet flow in the ZyWALL.

Ethernet -> VLAN -> Encap -> ALG  -> DNAT-> Routing -> FW -> IDP -> AP-> CF -> AV 
-> AS -> SNAT -> BWM -> Encap -> VLAN -> Ethernet

Table 4   Packet Flow Key

Ethernet

The interface on which the packet is received or sent

VLAN

Virtual LAN

Encap

The PPPoE or PPTP encapsulation used

ALG

Application Layer Gateway

DNAT

Destination NAT

Routing

Routing includes policy routes, interface routing, static routes and load balancing 
for example.

FW

Firewall (Through ZyWALL)

zFW

Firewall (To ZyWALL)

IDP

Intrusion Detection & Protection

ADP

Anomaly Detection and Protection

AP

Application Patrol

AS

Anti-spam

CF

Content Filtering

SNAT

Source NAT

IPSec D/E

VPN Decryption/Encryption

BWM

Bandwidth Management

RM

Remote Management (System)

AV

Anti-Virus