ZyXEL Communications ZyWALL USG 50 User Manual page 94

Chapter 6 Configuration Basics
Filter > Anti-Spam > SNAT > Bandwidth Management > Fragmentation > Traffic
Out.
Figure 53 Packet Flow
The packet flow is 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
traffic).
The ZyWALL automatically adds all of the external interfaces to the default WAN
trunk. External interfaces include ppp and cellular interfaces as well as any
Ethernet interfaces that are set as external interfaces.
Examples of internal interfaces are 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.
• You do not need to set up policy routes for 1:1 NAT entries.
• You can create Many 1:1 NAT entries to translate a range of private network
addresses to a range of public IP addresses
• Static and dynamic routes have their own category.
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ZyWALL USG 50 User's Guide