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Viewing SNMP Objects
The SNMP tool lets you view information on a remote device that has an SNMP agent. To view SNMP information:
- From the Tools menu, select Net Tools, and click the SNMP tab to display the SNMP options.
- In the Address box, enter the host name or IP address of the device for which you want to view SNMP objects, or select one from the list box.
- If necessary, change the text in the Community box. The default string is "public."
SNMP (Version 1) as a protocol does not support security. Security is implemented within the SNMP manager itself (on the device) by specifying the IP addresses from which it will accept requests. However, simple security can be implemented by use of the community string.
The default string (public) will work for most SNMP hosts unless the administrator has specifically removed public and replaced it with a string of his/her own. If you know a device is manageable via SNMP and "public" doesn't work, you will have to talk to the owner of that device to get a community name that will work.
- In the What box, type an SNMP object name or identifier to retrieve, or click the button next to the What box to display the MIB tree view of the SNMP objects.
Each SNMP object has a name and numeric identifier. For example, in the "system" group, the network object named SysDescr with object identifier 1.3.6.1.2.1.1.1 contains a description of the device.
An object can have one or more instances, depending on the configuration of the monitored device. For example, a device can have two network adapters, in which case there will be two instances of the ifPhysAddress object, which has object identifier 1.3.6.1.2.1.2.2.1.6. In this case, you need to specify an instance number at the end of the object identifier (such as 1.3.6.1.2.1.2.2.1.6.1). If you do not specify an instance number, it defaults to zero. For more information on SNMP objects, see "SNMP Overview".
Note: Entering *sysInfo in the What box returns most of the "system" identification objects.
- Select one of the option buttons:
Get. If you know the object name or identifier, you can enter it in the What box and use the Get option. For example, on a Windows NT system, a Get request for ifPhysAddress.2 returns the network adapter address. If it is a wrong name or number, you will not get any information back. If there is more than one instance of the object, you need to enter the specific instance.
Get Next. Use Get Next to get the next object instance from a table or list within the SNMP agent on the device. You can determine the values to use in the What box by what is returned using Get Next. You should use this option with most of the items that are in the MIB.
Get All Subitems. This option returns any subitems of the named item.
Monitor. Starts the SNMP Graphing Utility and graphs the network object specified in the What box. For more information on graphing, see "Graphing SNMP Values".
- (Optional) Change the Delay setting from the default of 1000 milliseconds. This value tells the SNMP tool how long to wait for a response to an SNMP request before reporting a timeout.
- Click Start to retrieve the SNMP information. Any information found for the object is shown in the results window.
 Ipswitch, Inc. http://www.ipswitch.com |
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