User Guide

System Level Screen
Local Management User’s Guide 1-17
Subnet Mask — This field displays the default Subnet Mask, and allows you to enter a new value
for the Subnet Mask if necessary. Subnets are logical divisions of the network that isolate groups
of devices. A subnet mask “masks out” the network bits of the IP address by setting the bits in the
mask to 1 when the network treats the corresponding bits in the IP address as part of the network
or subnetwork address, or to 0 if the corresponding bit identifies the host. The default subnet mask
uses the first two portions of the IP address to identify the net id, leaving the rest of the IP address
to identify specific nodes.
• When the management workstations designated to receive SNMP traps reside on the same
network as the HSIM or CyberSWITCH, use the Subnet Mask default setting for the IP address
entered on the System Level screen.
• Set a new value for the Subnet Mask when the management workstations designated to receive
SNMP traps reside on a different subnet (for example, across a gateway or router).
To set a Subnet Mask, refer to Setting the Subnet Mask.
Phys Address — This field displays the physical address of the HSIM or CyberSWITCH. You
cannot modify the physical address.
Default Gateway — Use this field to enter the IP address for the Default Gateway, intended for
bridging only mode. For routing use a default route entry in your routing table. This field contains
the IP address of the device to which all packets addressed to an unknown network or host are sent.
The HSIM or CyberSWITCH relies on a Default Gateway to provide the routes to destinations that
are not listed in its own IP Forwarding Table, and to forward SNMP traps to a management station.
The default setting for this field is NONE DEFINED. To set the Default Gateway, refer to Setting
the Default Gateway.
Default Interface — Use this field to select the default interface for the HSIM or CyberSWITCH
Default Gateway, intended for bridging only mode. For routing use a default route entry in your
routing table. The default interface is the channel which is set up to handle SNMP traps sent to an
IP station that is not on the same subnet as the HSIM or CyberSWITCH in an IP routed
environment. The default setting for this field is NONE DEFINED. To set the default interface for
the Default Gateway of the HSIM or CyberSWITCH, refer to Setting the Default Interface.