APC NetBotz 200 Guide de l'utilisateur télécharger pdf (Page 13)

USER’S GUIDE

NetBotz Rack Monitor 200

Watchdog Features

Overview

To detect internal problems and recover from unanticipated inputs, the Main Module

uses internal, system-wide watchdog mechanisms. When it restarts to recover from an

internal problem, a System: Warmstart event is recorded in the event log.

Network interface watchdog mechanism

The Main Module implements internal watchdog mechanisms to protect itself from

becoming inaccessible over the network. For example, if the Main Module does not

receive any network traffic for 9.5 minutes (either direct traffic, such as SNMP, or

broadcast traffic, such as an Address Resolution Protocol [ARP] request), it assumes

that there is a problem with its network interface and restarts.

Resetting the network timer

To ensure that the Main Module does not restart if the network is quiet for 9.5 minutes,

the Main Module attempts to contact the Default Gateway every 4.5 minutes. If the

gateway is present, it responds to the Main Module, and that response restarts the 9.5-

minute timer. If your application does not require or have a gateway, specify the IP

address of a computer that is running on the network most of the time and is on the

same subnet. The network traffic of that computer will restart the 9.5-minute timer

frequently enough to prevent the Main Module from restarting.

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APC NetBotz 200 Guide de l'utilisateur Page 13