Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 313)

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Note - In both configurations that the incoming client traffic is assumed to originate on the other side of the gateway

device for the subnets on which Equalizer and the servers reside. The servers will usually have their default gateway

set to something other than Equalizer so that they can respond directly to client requests.

Configuring Direct Server Return

In a typical load balancing scenario, server responses to client requests are routed through Equalizer on their way

back to the client. Equalizer examines the headers of each response and may insert a cookie, before sending the

server response on to the client.

In a Direct Server Return (DSR) configuration, the server receiving a client request responds directly to the client

IP, bypassing Equalizer. Because Equalizer only processes incoming requests, cluster performance is

dramatically improved when using DSR in high bandwidth applications, especially those that deliver a significant

amount of streaming content. In such applications, it is not necessary for Equalizer to receive and examine the

server’s responses: the client makes a request and the server simply streams a large amount of data to the client.

DSR is supported on Layer 4 TCP and UDP clusters only, and is not supported for FTP clusters (Layer 4 TCP

clusters with a start port of 21). Port translation or port mapping is not supported in DSR configurations.

DSR configurations are usually configured in single network mode, where the cluster IP and the server IPs are all

on the internal interface. An example single network mode DSR configuration is shown below:

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