SNMP

Hello Experts,

I am looking for some docs that would show as to how SNMP works.  I've just installed nagios and it is running and doing some monitoring, but now I want to monitor utilizing SNMP.  Struggling to find some docs that would explain the basic fundamentals of SNMP.  Any links or suggestions re: this subject matter would greatly be appreciated.

As always, thank you for your time on this mater.
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coperatorAsked:
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Cyclops3590Commented:
http://www.tcpipguide.com/free/t_TCPIPSimpleNetworkManagementProtocolSNMPProtocol.htm

This is from the TCP/IP Guide which covers most of the TCP/IP technologies briefly, but in depth enough to get you a working knowledge.
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dkarpekinCommented:
Here is very easy way to understand.........
Download www.solarwinds.com evaluation version of Orion, or Toolset, probably toolset is little easier to begin with.
Choose hardware to monitor, and enable SNMP , usially "public" used to obtain info  from devices, and "private" to set configuration.
SNMP use UDP 161 and  UDP 162 -remember keep them open on firewalls.
You can set WinXP boxes to monitor very easy- "services"-snmp-snmp service-security.place "public" and make it run in"automatic".
If no "SNMP service" present under admin tools- services....installed by "windows components" using WinXP CD.
To start all this should not take too long,  probably can be achieved incouple hours.
snmp-example-alerts-cisco-switch.JPG
snmp-example.JPG
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Cyclops3590Commented:
keep in mind though that for the firewall rules its 161/udp from the monitoring server to the monitored device and 162/udp from the monitored device to the monitoring server.

This is because 161/udp is the default port for snmp polling and 162/udp is the default for snmp traps.
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Cyclops3590Commented:
coperator,

For future reference, if you plan to give someone less than an A grade, it would be helpful if you could give some feedback as to why the comments given was not considered a complete solution and what could be made clearer as well.  With no comment, we can only guess as to what we think is a solution for your question and not realize we may not be interpreting what you're asking complete correctly.  Thanks.
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