Chapter 7 Tutorials

6The ZyWALL automatically adds the cellular interface to the system default WAN trunk. If the ZyWALL is using a user-configured trunk as its default trunk and you want this cellular interface to be part of it, use the Trunk screens to add it.

This way the ZyWALL can automatically balance the traffic load amongst the available WAN connections to enhance overall network throughput. Plus, if a WAN connection goes down, the ZyWALL still sends traffic through the remaining WAN connections. For a simple test, disconnect all of the ZyWALL’s wired WAN connections. If you can still access the Internet, your cellular interface is properly configured and your cellular device is working.

To fine-tune the load balancing configuration, see Chapter 12 on page 271. See also Section 7.3 on page 115 for an example.

7.3How to Configure Load Balancing

This example shows how to configure a trunk for two WAN connections (to the Internet). The available bandwidth for the connections is 1Mbps (wan1) and 512 Kbps (wan2) respectively. As these connections have different bandwidth, use the Weighted Round Robin algorithm to send traffic to wan1 and wan2 in a 2:1 ratio.

Figure 63 Trunk Example

wan1: 1 Mbps

wan2: 512 Kbps

You do not have to change many of the ZyWALL’s settings from the defaults to set up this trunk. You only have to set up the outgoing bandwidth on each of the WAN interfaces and configure the WAN_TRUNK trunk’s load balancing settings.

7.3.1 Set Up Available Bandwidth on Ethernet Interfaces

Here is how to set a limit on how much traffic the ZyWALL tries to send out through each WAN interface.

 

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ZyWALL USG 50 User’s Guide