ZyXEL Communications 200 Series - Manual (Page 59)

Chapter 2 Features and Applications
ZyWALL USG 100/200 Series User’s Guide
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Application Patrol
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.
2.2 Packet Flow
The following is the key used to describe the packet flow in the ZyWALL.
2.2.1 Interface to Interface (Through 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