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Chapter 8 WAN Screens
ZyWALL 2WG User’s Guide
168
This algorithm is best suited for situations when the bandwidths set for the two WAN
interfaces are different.
For example, in the figure below, the configured available bandwidth of WAN1 is 1M and
WAN2 is 512K. You can set the ZyWALL to distribute the network traffic between the two
interfaces by setting the weight of WAN1 and WAN2 to 2 and 1 respectively. The ZyWALL
assigns the traffic of two sessions to WAN1 for every one session's traffic assigned to WAN2.
Figure 105 Weighted Round Robin Algorithm Example
8.4.3 Spillover
With the spillover load balancing algorithm, the ZyWALL sends network traffic to the
primary interface until the maximum allowable load is reached, then the ZyWALL sends the
excess network traffic of new sessions to the secondary WAN interface. Configure the Route
Priority metrics in the WAN General screen to determine the primary and secondary WANs.
In cases where the primary WAN interface uses an unlimited access Internet connection and
the secondary WAN uses a per-use timed access plan, the ZyWALL will only use the
secondary WAN interface when the traffic load reaches the upper threshold on the primary
WAN interface. This allows you to fully utilize the bandwidth of the primary WAN interface
while avoiding overloading it and reducing Internet connection fees at the same time.
In the following example figure, the upper threshold of the primary WAN interface is set to
800K. The ZyWALL sends network traffic of a new session that exceeds this limit to the
secondary WAN interface.
Figure 106 Spillover Algorithm Example