User's Manual

UTT Technologies Chapter 6 Basic Setup
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respectively.
Ɣ In the case of Partial Load Balancing, let¶s assume that connection A and B are
used as primary connections, and connection C and D are used as backup
connections, then we may set connection A¶s and B¶s Weight to 5 and 3 respectively,
and set both connection C¶s and D¶s Weight to 1.
6.3.2.2 Two Load Balancing Policies
The
Load Balancing Policy
is used to control and balance the traffic among multiple
Internet connections. And the Device provides two load balancing policies: load balancing
based on IP address and load balancing based on NAT session. Their implementation
mechanisms are as follows.
1. Load Balancing Based on IP Address
Note that here we assume that each LAN host only has one IP address.
If you choose IP address as the load balancing policy, the Device will assign the LAN
hosts¶ IP addresses to each Internet connection in turn. The ratio of the numbers of the IP
addresses assigned to each connection is the same with the ratio of connection¶s Weight.
In this case, the NAT sessions initiated from the same IP address will use the same
connection, that is, a LAN host will use only one Internet connection to access the
Internet.
For example, there are three Internet connections whose Weights are 3, 2 and 1
respectively. Then in the sequence of accessing the Internet, the first, second and third
LAN hosts will use the first connection, the fourth and fifth LAN hosts will use the second
connection, the sixth LAN hosts will use the third connection; in turn the seventh, eighth
and ninth LAN hosts will use the first connection ... and so on.
2. Load Balancing Based on NAT Session
If you choose NAT session as the load balancing policy, the Device will assign the NAT
sessions to each Internet connection in turn. The ratio of the numbers of the NAT sessions
assigned to each connection is the same with the ratio of each connection¶s Weight. In
this case, the NAT sessions initiated from the same LAN host will use different
connections, that is, a LAN host will use multiple connections to access the Internet.
For example, there are three Internet connections whose Weights are 3, 2 and 1
respectively. Then in the sequence of accessing the Internet, the first, second and third
NAT sessions initiated from the LAN hosts will use the first connection, the fourth and fifth
NAT sessions will use the second connection, the sixth NAT sessions will use the third
connection; in turn the seventh, eighth and ninth NAT sessions will use the first
connection ... and so on.