FAQ:Agent 25

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How do I configure SNMPv3 users?

There are three ways to configure SNMPv3 users:

  • Stop the agent, and add the line
  createUser {myUser} MD5 {myPassword} DES

to the file /var/net-snmp/snmpd.conf (where {myUser} and {myPassword} are the appropriate values for username and password, without the braces!). Then re-start the snmpd agent.

  • Stop the agent, run the command
  net-snmp-config --create-snmpv3-user

and follow the prompts given. This will create an entry in the /var/net-snmp/snmpd.conf file similar to the above. Then re-start the snmpd agent.

  • Make sure the agent is running, and will respond to an SNMPv3 request (using an existing user with the desired authentication and privacy protocols). Then use the 'snmpusm' command to clone this template user, and change the password.

See the access control entries above and the file 'README.snmpv3' for more details about how to use SNMPv3 users,

Note that simply having a 'rouser' or 'rwuser' line does not automatically create the corresponding SNMPv3 user. You will need the above 'createUser' line (or an equivalent 'usmUser') as well.

  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?