FAQ:Agent 15

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What traps are sent by the agent?

The Net-SNMP agent sends a 'coldStart(0)' trap when it first starts up, and an enterprise-specific trap 'nsNotifyShutdown' when it stops. It generates an enterprise-specific trap 'nsNotifyRestart' (rather than the standard 'coldStart(0)' or 'warmStart(1)' traps) on receiving a HUP signal - typically after being re-configured. It can also be configured to send an 'authenticationFailure(4)' trap when it receives an SNMPv1 (or SNMPv2c) request using an unknown community name.

The agent does not send 'linkUp' or 'linkDown' traps by default. It can be configured to do this using the directive 'linkUpDownNotifications'. See the 'snmpd.conf(5)' man page (under ACTIVE MONITORING) for details.

Similarly, it does not generate traps by default when one of the monitored characteristics (disk usage, running processes, etc) enters or leaves an error state. This can be configured using the 'defaultMonitors' directive (again documented under ACTIVE MONITORING).

  1. What MIBs are supported?
  2. What protocols are supported?
  3. How do I configure the agent?
  4. How do I remove a MIB from the agent?
  5. I've installed a new MIB file. Why can't I query it?
  6. How do I add a MIB to the agent?
  7. What's the difference between 'exec', 'sh', 'extend' and 'pass'?
  8. What's the difference between AgentX, SMUX and proxied SNMP?
  9. What is the purpose of 'dlmod'?
  10. Which extension mechanism should I use?
  11. Can I use AgentX when running under Windows?
  12. How can I run AgentX with a different socket address?
  13. How can I turn off SMUX support?
  14. How can I combine two copies of the 'mib2' tree from separate subagents?
  15. What traps are sent by the agent?
  16. Where are these traps sent to?
  17. How can I send a particular trap to selected destinations?
  18. When I run the agent it runs and then quits without staying around. Why?
  19. After a while the agent stops responding, and starts eating CPU time. Why?
  20. How can I stop other people getting at my agent?
  21. How can I listen on just one particular interface?
  22. The agent is complaining about 'snmpd.conf'. Where is this?
  23. Why does the agent complain about 'no access control information'?
  24. How do I configure access control?
  25. How do I configure SNMPv3 users?
  26. The 'createUser' line disappears when I start the agent. Why?
  27. What's the difference between /var/net-snmp and /usr/local/share/snmp?
  28. My new agent is ignoring the old snmpd.conf file. Why?
  29. Where should the snmpd.conf file go?
  30. Why am I getting "Connection refused"?
  31. Why can't I see values in the UCDavis 'extensible' or 'disk' trees?
  32. Why can't I see values in the UCDavis 'memory' or 'vmstat' tree?
  33. What do the CPU statistics mean - is this the load average?
  34. How do I get percentage CPU utilization using ssCpuRawIdle?
  35. What about multi-processor systems?
  36. The speed/type of my network interfaces is wrong - how can I fix it?
  37. The interface statistics for my subinterfaces are all zero - why?
  38. Does the agent support the RMON-MIB?
  39. What does "klread: bad address" mean?
  40. What does "nlist err: wombat not found" (or similar) mean?
  41. What does "Can't open /dev/kmem" mean?
  42. The system uptime (sysUpTime) returned is wrong!
  43. Can the agent run multi-threaded?
  44. Can I use AgentX (or an embedded SNMP agent) in a threaded application?