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Psion Teklogix 9160 G2 Wireless Gateway User Manual 215
Chapter 21: Configuring SNMP
Configuring SNMP Traps
21.3.1 Configuring SNMP Traps
SNMP Traps facilitate asynchronous communication of messages from SNMP
managed devices (like the 9160 G2 Wireless Gateway) to designated hosts. If a
Network Management System (NMS) is responsible for monitoring a large number
of devices on a network, it is not practical to periodically query every device on the
network. By enabling SNMP event traps on the AP, individual devices can send
messages directly to SNMP Managers or to other designated hosts on the NMS
Restrict the source of
SNMP requests to only the
designated hosts or subnets
You can restrict the source of permitted SNMP requests.
• To restrict the source of permitted SNMP requests, click Enabled.
• To permit any source submitting an SNMP request, click Disabled.
Hostname or subnet of Net-
work Management System
Specify the DNS hostname or subnet of the machines that can execute GET and SET
requests to the managed devices.
As with community names, this provides a level of security on SNMP settings. The SNMP
agent will only accept requests from the hostname or subnet specified here.
To specify a subnet, enter one or more subnetwork address ranges in the form Address-
Range/MaskLength, where AddressRange is an IP address and MaskLength is the num-
ber of mask bits. Both formats ‘NetAddress/NetMask’ and ‘NetAddress/MaskLength’ are
supported. Individual hosts can be provided for this, i.e. I.P Address or Hostname. For
example, if you enter a range of
192.168.1.0/24
this specifies a subnetwork with
address
192.168.1.0
and a subnet mask of
255.255.255.0
.
The address range is used to specify the subnet of the designated NMS. Only machines
with IP addresses in this range are permitted to execute GET and SET requests on the
managed device. Given the example above, the machines with addresses from
192.168.1.1
through
192.168.1.254
can execute SNMP commands on the
device. (The address identified by suffix
.0
in a subnetwork range is always reserved for
the subnet address, and the address identified by
.255
in the range is always reserved
for the broadcast address).
As another example, if you enter a range of
10.10.1.128/25
, machines with IP
addresses from
10.10.1.129
through
10.10.1.254
can execute SNMP
requests on managed devices. In this example,
10.10.1.128
is the network address
and
10.10.1.255
is the broadcast address.
126
addresses would be designated.
Field Description
Table 21.2 SNMP Settings