ZyXEL Communications ZyWall USG 50-H Series, User Manual

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Chapter 2 Features and Applications
ZyWALL USG 50-H User’s Guide
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The ZyWALL’s ADP protects against network-based intrusions. See Section 27.3.4 on page
428 and Section 27.3.5 on page 430 for more on the kinds of attacks that the ZyWALL can
protect against. You can also create your own custom ADP rules.
Bandwidth Management
Bandwidth management allows you to allocate network resources according to defined
policies. This policy-based bandwidth allocation helps your network to better handle
applications such as Internet access, e-mail, Voice-over-IP (VoIP), video conferencing and
other business-critical applications.
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.
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)
ADP Anomaly Detection and Protection
AP Application Patrol
SNAT Source NAT
IPSec D/E VPN Decryption/Encryption
BWM Bandwidth Management
RM Remote Management (System)