Packet Flow; Interface To Interface (Through Zywall); Table 4 Packet Flow Key - ZyXEL Communications ZyWALL 1050 User Manual

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

This section lists the order in which the ZyWALL applies its features and checks. The
following is the key used to describe the packet flow in the ZyWALL.

Table 4 Packet Flow Key

Ethernet
VLAN
Encap
ALG
DNAT
Routing
FW
zFW
IDP
ADP
AP
AS
CF
SNAT
IPSec D/E
BWM
RM
AV

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
ZyWALL 1050 User's Guide
The interface on which the packet is received or sent
Virtual LAN
The PPPoE or PPTP encapsulation used
Application Layer Gateway
Destination NAT
Routing includes policy routes, interface routing, static routes and load balancing
for example.
Firewall (Through ZyWALL)
Firewall (To ZyWALL)
Intrusion Detection and Protection
Anomaly Detection and Protection
Application Patrol
Anti-spam
Content Filtering
Source NAT
VPN Decryption/Encryption
Bandwidth Management
Remote Management (System)
Anti-Virus
Chapter 2 Features and Applications
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