Coyote Point Systems Equalizer GX Series, Administration Manual

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Servers
Server Configuration Constraints
When configuring servers on Equalizer, you must observe the following constraints:
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In general, there must be no Layer 3 devices (e.g., such as a router) between a server and
Equalizer in order for health check probes to work correctly.
l
Equalizer operation depends on reliable communication between Equalizer and the servers
behind it. The latency introduced by Layer 3 devices such as routers can, for example, res-
ult in connection time-outs even when the server is available.
l
If you require remote servers in your clusters, you must be very careful to configure net-
work routes that allow Equalizer and the server to communicate. It may also be necessary
to reconfigure probe time-outs in order to account for network latency.
An example of a configuration with both directly connected servers and remotely accessible
servers is illustrated in the diagram below.
The configuration shown above is an example of a single VLAN configuration, where Equalizer
communicates with all servers and clients via the same subnet. The example cluster shown above
contains three servers, two on the local 10.0.0.0 subnet, and one on another subnet.
In this example, a static route would be needed on Equalizer to forward all packets for the
172.16.0.0 network to the gateway at 10.0.0.172. Similarly, the server at 172.16.0.33 would need
a static route that forwards all traffic for the 10.0.0.0 network through 172.16.0.10, the gateway
address for the 10.0.0.0 network.
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