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Configuring Routing on Servers

The way you configure routing on servers behind Equalizer depends largely on whether Equalizer’s spoof option is

enabled on a cluster.

Spoof Controls SNAT

If spoof is

disabled

, SNAT (Source Network Address Translation) is performed on client requests before sending

them on to the server -- the source address used in the packet sent to the server is Equalizer’s IP address on the

VLAN used to communicate with the server.

If spoof is

enabled

, SNAT is

not

performed on client requests before sending them on to the server -- the source

address used in the packet sent to the server is the

client’s

IP address.

How Spoof Influences Routing

When spoof is

disabled

, special routing is usually not required on servers, since they will respond to Equalizer’s IP

address on the appropriate VLAN.

When spoof is

enabled

, you should configure your servers so that Equalizer gateways the packets the servers

send to clients. If you do not adjust the routing on your servers when the spoof option is enabled, servers will not

route responses through Equalizer and clients receiving such responses directly from servers will drop the

responses and the client connection will time out. An easy way to do this is to configure the server's default

gateway to be an address on an Equalizer subnet. If this is not possible, then static routes should be used to

properly route client requests back to Equalizer.

Direct Server Return (DSR) configurations with Layer 4 clusters are an exception to this rule. In DSR

configurations, client requests coming through Equalizer are routed to servers, which then respond directly back to

the clients without going through Equalizer. Therefore, servers in a DSR configuration typically have a default

gateway other than Equalizer.

In non-DSR clusters with spoof enabled, you should use one of the following Equalizer addresses as the default

gateway on the server (for the server instance on the server pool in the cluster):

l If the servers are connected to a single (standalone) Equalizer, the

default

gateway IP address that

you should use on the server is Equalizer’s IP address on the VLAN associated with the Equalizer front-

panel port to which the server is connected.

l If the servers are connected to two Equalizers in a failover configuration, the

default

gateway IP

address that you should use on the server is always Equalizer’s failover IP address on the VLAN

associated with the Equalizer front-panel port to which the server is connected.

The commands or utilities that you use to configure routing on a server depends on the server’s operating system,

but usually involves some form of the route command. Check your server operating system documentation. To

verify that you have configured a server’s routing correctly, trace the route from the server to a destination address

outside the internal network to ensure that Equalizer gets used as a gateway. On UNIX systems, use the

traceroute utility; on Windows, use tracert.

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Equalizer Administration Guide

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