September 2005
Beginner
462 pages
12h 56m
English
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USM
The User-based Security Model (USM ) and the View Access Control Model (VACM) together detail the security enhancements added with SNMPv3 . Let's start with the USM.
The Basics
We need to get some terminology out of the way before we can look at the USM in any detail:
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snmpEngineID This is an unambiguous identifier for an SNMP engine as well as the SNMP entity that corresponds to the engine. The syntax for this identifier is
OctetStringand it cannot be zero length. Most SNMPv3 applications allow for the user to input a value forsnmpEngineID. If one is not specified, the value is computed using a combination of enterprise ID and IP or MAC address.-
snmpEngineBoots A count of the number of times an SNMP engine has rebooted.
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snmpEngineTime The number of seconds since the
snmpEngineBootscounter was last incremented.-
snmpSecurityLevel There are three security levels. The first is no authentication or privacy (noAuthNoPriv). Note that if this mode is used, a
securityNameis still required. The second is authentication and no privacy (authNoPriv). The third and final one is authentication and privacy (authPriv). While you can have authentication without privacy, you cannot have privacy without authentication.- Authoritative SNMP engine
A nonauthoritative engine must discover the
snmpEngineIdof the authoritative engine with which it communicates. The rules for designating the authoritative engine are as follows: if the SNMP message requires a response (get, getnext, getbulk, set, or ...
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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.