Troubleshoot SNMP communications issues

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What is SNMP? What are the basic SNMP components? How SNMP Works and How SNMP communication happens? How can I troubleshoot my SNMP communications issues?

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The first 3 questions can be answered with a google search of "snmp". This page on wikipedia is a good starting point.

The last question is more interesting, and really depends on what the problem is. The most common issue is connectivity between SNMP agent and management app:

  1. Can you ping it? If not, resolve that, google "cannot ping".
  2. Does it respond to ANY request? If not, try a packet analyser such as wireshark otherwise google "cannot snmpwalk"

Anything else is problem-specific and can probably be googled.