Chapter 22 Virtual Servers
ZyWALL Series CLI Reference Guide
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Figure 23 Load Balancing Overview
1 A client connects to the Zyxel Device on IPv4 address 1.1.1.2 (the virtual server external IP address).
2 The Zyxel Device matches the connection request to a set of real servers (1, 2, and 3 in Figure 23 on
page 199), and then determines which server will handle the request using a user-specified load
balancing algorithm.
3 The Zyxel Device forwards the request to the chosen server using NAT.
4 The server processes the request, and then replies to the Zyxel Device.
5 The Zyxel Device forwards the reply to the client using SNAT.
22.3.4 Load Balancing Rules
In order to use load balancing, you must create a load balancing rule. Each load balancing rule
consists of an incoming interface, an external IP address, a service type, a load balancing algorithm,
and a list of real servers.
Note: One real server can belong to multiple load-balancing rules.
Note: You can only add one interface, IP address, and port to each load balancing rule.
Note: Virtual servers and real servers only support IPv4.
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