User`s guide

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USER’S GUIDE
Network Management Card
12
Network interface watchdog mechanism
The Management Card implements internal watchdog mechanisms to protect itself
from becoming inaccessible over the network. For example, if the Management Card
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 Management Card does not restart if the network is quiet for 9.5
minutes, the Management Card attempts to contact the default gateway every 4.5
minutes. If the gateway is present, it responds to the Management Card, 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 Management Card from restarting.