EMM-E6 Ethernet User's Guide

MODIFYING A SUBNET MASK
EMM-E6 User’s Guide 7-5
7.4 MODIFYING A SUBNET MASK
The EMM-E6 automatically enters the natural Subnet Mask for any IP
address that you enter. A natural Subnet Mask is a logical separation
between network and host identifiers within the IP address. The EMM-E6
allows you to modify this mask to best suit your needs.
The Subnet Mask defines how your EMM-E6 treats SNMP trap IP
destination addresses in its Trap table (see Chapter 8, Trap Table Screen,
for additional information on traps).
Using the Subnet Mask, the EMM-E6 logically determines one of two
possible locations, either on or not on its own subnet, for each trap IP
destination address in its trap table. If the address is on its own subnet, the
EMM-E6 transmits directly to the workstation with that address. If the
address is not on its subnet, the EMM-E6 transmits to the workstation
with that IP address combined with the default gateway router MAC
address.
Use the natural Subnet Mask when:
• workstations in the Trap table reside on a different subnet (i.e.,
across a gateway or external router), and you want these
workstations to receive SNMP traps
• the EMM-E6 provides a natural subnet mask that fits your host/
network identifier scheme.
Modify the natural Subnet Mask when:
• workstations in the Trap table reside on a different subnet (i.e.,
across a gateway or external router), and you want these
workstations to receive SNMP traps
Consult your Network Administrator prior to modifying any
of the natural Subnet Masks.
NOTE
CH1Book Page 5 Wednesday, March 20, 1996 7:48 AM