September 2005
Beginner
462 pages
12h 56m
English
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Setting a MIB Value
With snmpget and snmpwalk, we have retrieved management information only from devices. The next logical step is to change the value of a MIB object via SNMP. This operation is known as snmpset, or set. In this section, we'll read the value of an object, use snmpset to change its value, and read the value again to prove that it's been changed.
There's obviously some danger here: what happens if you change a variable that's critical to the state of the system you're monitoring? In this chapter, we'll deal only with some simple objects, such as the administrative contact, that won't damage anything if they're changed incorrectly. Therefore, if you keep the OIDs correct, you shouldn't worry about hurting any of your devices. All the objects we set in this chapter have an ACCESS of read-write. It's a good idea to get a feel for which objects are writable by reading the MIB in which the object is defined—either one of the RFCs, or a MIB file provided by your vendor.
Let's get started. Run the following OpenView command (or use one of the other programs we've discussed) to find out the sysContact for your chosen device:
$ /opt/OV/bin/snmpget -c public orarouter1 .1.3.6.1.2.1.1.4.0
system.sysContact.0 : DISPLAY STRING- (ascii): ORA IT GroupThe -c public switch passes the community string public to the snmpget command.
Tip
Keep in mind that your devices shouldn't use the same (default) community strings that are used in this book. In addition, using the same string for the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.