ZyXEL 2WG User Guide

 Chapter 8 WAN and 3G Screens

ZyWALL 2WG User’s Guide

Figure 113   Spillover Algorithm Example

To load balance using the spillover method, select Spillover in the Load Balancing 
Algorithm field.
Configure the Route Priority metrics in the WAN General screen to determine the primary 
and secondary WANs. By default, WAN 1 is the primary WAN and WAN 2 is the secondary 
WAN.  

Figure 114   Load Balancing: Spillover

The following table describes the related fields in this screen.

Table 36   Load Balancing: Spillover

Active/Active 

Mode

Select Active/Active Mode and set the related fields to enable load balancing on 

the ZyWALL. 

Load Balancing 

Algorithm

Set the load balancing method to Spillover.

WAN Interface 

to Local Host 

Mapping 

Timeout 

Select this option to have the ZyWALL send all of a local computer’s traffic through 

the same WAN interface for the period of time that you specify (1 to 600 seconds). 
This is useful when a redirect server forwards a local user’s request for a file and 

informs the file server that a particular WAN IP address is requesting the file. If the 

user’s subsequent sessions came from a different WAN IP address, the file server 

would deny the request. 

Time Frame

You can set the ZyWALL to get the measured bandwidth using the average 

bandwidth in the specified time interval. 
Enter the time interval between 10 and 600 seconds. 

Send traffic to 

secondary WAN 

when primary 

WAN bandwidth 

exceeds  

Specify the maximum allowable bandwidth on the primary WAN. Once this 

maximum bandwidth is reached, the ZyWALL sends the new session traffic that 

exceeds this limit to the secondary WAN. The ZyWALL continues to send traffic of 

existing sessions to the primary WAN.