Chapter 6 Configuration Basics
ZyWALL USG 100/200 Series User’s Guide
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6.4 Packet Flow
Here is the order in which the ZyWALL applies its features and checks.
Figure 58 Packet Flow
6.4.1 ZLD 2.20 Packet Flow Enhancements
ZLD version 2.20 has been enhanced to simplify configuration. The packet flow
has been changed as follows:
• Automatic SNAT and WAN trunk routing for traffic going from internal to
external interfaces (you don’t need to configure anything to all LAN to WAN or
WLAN to WAN traffic).
The ZyWALL automatically adds all of the external interfaces to the default WAN
trunk. External interfaces include ppp, cellular, and AUX interfaces as well as
any Ethernet interfaces that are set as external interfaces.
Examples of internal interfaces are WLAN interfaces and any Ethernet interfaces
that you configure as internal interfaces.
• A policy route can be automatically disabled if the next-hop is dead.
• You do not need to set up policy routes for IPSec traffic.
• Policy routes can override direct routes.
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