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to the IP address of every configured server object. The timeouts that control Layer 3 Health Check probes are

located in the global CLI context and on the EQUALIZER > Global tab in the GUI:

Layer 3 Health Check Parameters

(CLIParameter)

Minimum Default Maximum Units

ICMP Probe Maximum Tries (icmp_maxtries) 0 3 30 integer

ICMP Probe Interval (icmp_interval) 0 15.0 60.0 seconds

By default, ICMP health check probes are sent a maximum of 3 times every 15 seconds to every configured server

that has Layer 3 probes enabled. Within a 15-second probe interval, the delay between successive ping requests

to the same server is determined internally -- it can be as short as one second to a server that is not responding to

ICMP requests and can be 5 seconds or longer when a server is responding to ICMP echo requests, depending on

the amount of traffic that Equalizer is currently processing.

If a server responds to an ICMP Health Check, it is marked "Layer 3 UP". If a server does not respond to an ICMP

echo request, it will be marked "Layer 3 DOWN" by Equalizer only if the server has responded to at least one

ICMP echo request since Equalizer was last rebooted. This behavior accounts for the fact that many servers are

configured by default to never respond to ICMP echo requests as a security precaution. In other words, if a server

has never responded to a Layer 3 health check probe since the last reboot, it is never marked "Layer 3 Down".

Note - Responding to ICMP echo requests is an option on most server platforms. If ICMP echo reply is disabled on one

or more of the servers in your configuration, then you may want to disable ICMP echo requests on Equalizer to reduce

traffic between Equalizer and the servers, and rely solely on the other probing mechanisms.

Layer 4 TCP and ACV Health Check Timeouts

By default, Equalizer sends TCP Health Checks to every server instance object in every server pool. Equalizer

and the server exchange a three-way TCP handshake to open a TCP connection. If Active Content Verification

(ACV) is also configured, the ACV probe takes place after the TCP connection is established. Once the

handshake is complete and ACV data is optionally exchanged, the probe connection is closed.

The controls to enable Layer 4 Health Checks are located on a server instance and on the server pool in which

server instances reside:

GUI Parameter (CLI Parameter) Location Description

Probe Layer 4 (probe_l4) server instance

A flag on a server instance, enabled by default. If disabled, no

TCP or ACV probes are sent to the server instance.

Probe Port (probe_port) server instance

Optional. If this parameter is 0 (the default) probe using the

port set on the server definition. If non-zero, use this

parameter setting as the port number r TCP and ACV

probes.

ACV Query (acvq) server pool

Optional. A string sent to the server instance after the TCP

handshake completes; the server instance is expected to

respond with a string that contains the ACV Response in the

first 1024 characters. If the ACV Response is not set, this

parameter has no effect.

ACV Response (acvr) server pool

Required to enable ACV probes. Thisis the string Equalizer

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Equalizer Administration Guide

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