Scenario 1 - Connecting Your Usg To The Internet; Application Scenario - ZyXEL Communications ZyWALL USG 20 User Manual

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– ZyWALL USG Support Notes
Scenario 1 — Connecting your USG to the Internet

1.1 Application Scenario

A WAN (Wide Area Network) connection is an outside connection to another network or the Internet. It connects your private network such as LAN (Local
Area Network) and other networks, so that a computer in one location can communicate with computers in other locations.
The USG has a multiple WAN feature which enables you to link your network with up to two ISPs or other networks via Ethernet, PPPoE or 3G connections.
User can either use trunks for WAN traffic load balancing to increase overall network throughput ("active-active" load sharing mode) or as a backup to
enhance network reliability ("active-passive" failover mode).
Load balancing will be described further in Scenario 2. In the figure below we first show the scenario for non-stop Internet access with the PPPoE as primary
WAN and 3G backup through USB. This means that the USG will normally use the PPPoE interface for Internet access, and it will only resort to the 3G interface
when the PPPoE interface's connection fails.
All contents copyright (c) 2010 ZyXEL Communications Corporation.
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