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Chapter 8 WAN and 3G Screens
ZyWALL 2WG User’s Guide
173
8.2.2 Configuring Load Balancing
To configure load balancing on the ZyWALL, click
NETWORK
>
WAN
in the navigation
panel. The
WAN General
screen displays by default. Select
Active/Active Mode
under
Operation Mode
to enable load balancing on the ZyWALL.
The
WAN General
screen varies depending on what you select in the
Load Balancing
Algorithm
field.
8.2.2.1 Least Load First
The least load first algorithm uses the current (or recent) outbound and/or inbound bandwidth
utilization of each WAN interface as the load balancing criteria for making decisions on how
how to route traffic. The outbound bandwidth utilization is defined as the measured outbound
throughput over the available outbound bandwidth. The inbound bandwidth utilization is
defined as the measured inbound throughput over the available inbound bandwidth. The two
ratios are indexes used to calculate which WAN interface is less utilized at the time. A new
LAN-originated session is distributed to the less utilized WAN interface.
8.2.2.2 Example 1
The following figure depicts an example where both the WAN interfaces on the ZyWALL are
connected to the Internet. The configured available outbound bandwidths for WAN 1 and
WAN 2 are 512K and 256K respectively.
Figure 109
Least Load First Example
If the outbound bandwidth utilization is used as the load balancing index and the measured
outbound throughput of WAN 1 is 412K and WAN 2 is 198K, the ZyWALL calculates the load
balancing index as shown in the table below.
Allow Trigger Dial Select this option to allow NetBIOS packets to initiate calls.
Apply
Click
Apply
to save your changes back to the ZyWALL.
Reset
Click
Reset
to begin configuring this screen afresh.
Table 31
NETWORK > WAN > General (continued)
LABEL
DESCRIPTION