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142 AT-TQ2403 - Management Software - User's Guide
Field Description
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
Network 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 AddressRange/MaskLength where AddressRange is an IP
address and MaskLength is the number 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.
Configuring SNMP Traps
SNMP Traps facilitate asynchronous communication of messages from SNMP managed devices (like the
AT-TQ2403 Management Software) 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 regarding some network
events, such as network interfaces going up or down, clients failing to associate or authenticate with the
access point, system power up or down and changes in the network topology.
SNMP traps save on network resources by eliminating redundant SNMP requests. They also make it
easier for SNMP Managers to troubleshoot their network. For example, if an SNMP manager is
responsible for a large network that supports many devices, and each device has a large number of
objects, it is impractical to request information from every object on every device. The optimum
solution is for each agent on the managed device to notify the manager of any unusual events. It does this