ZyXEL UAG715 User Guide - Page 144
Link Sticking, Load Balancing Algorithms
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Chapter 9 Trunks • If that interface's connection goes down, the UAG can still send its traffic through another interface. • You can define multiple trunks for the same physical interfaces. Link Sticking You can have the UAG send each local computer's traffic that is going to the same destination through a single WAN interface for a specified period of time. This is useful when a server requires authentication. For example, the UAG sends a user's traffic through one WAN IP address when he logs into a server B. If the user's subsequent sessions came from a different WAN IP address, the server would deny them. Here is an example. Figure 92 Link Sticking 1 wan1 2 wan2 3 B LAN A 1 LAN user A logs into server B on the Internet. The UAG uses wan1 to send the request to server B. 2 The UAG is using active/active load balancing. So when LAN user A tries to access something on the server, the request goes out through wan2. 3 The server finds that the request comes from wan2's IP address instead of wan1's IP address and rejects the request. If link sticking had been configured, the UAG would have still used wan1 to send LAN user A's request to the server and server would have given the user A access. Load Balancing Algorithms The following sections describe the load balancing algorithms the UAG can use to decide which interface the traffic (from the LAN) should use for a session2. The available bandwidth you configure on the UAG refers to the actual bandwidth provided by the ISP and the measured bandwidth refers to the bandwidth an interface is currently using. 2. In the load balancing section, a session may refer to normal connection-oriented, UDP or SNMP2 traffic. 144 UAG715 User's Guide