FAQ:Applications 06

I can see the system group, but nothing else. Why?

This is almost definitely due to the access configuration of the agent. Many pre-configured systems (such as most Linux distributions) will only allow access to the system group by default, and need to be configured to enable more general access.

The easiest way to test this is to try a GETNEXT request that ought to return the entry of interest. e.g.

       snmpgetnext -v1 -c public localhost ucdavis.version.versionTag

instead of

       snmpget     -v1 -c public localhost ucdavis.version.versionTag.0

If the agent responds with "end of MIB" or a different object, then either the agent doesn't implement that particular object at all, or the access control won't allow you access to it.

See the entries on access control in the AGENT section for how to configure the Net-SNMP agent, or consult the agent's own documentation.

   FAQ:Applications

1. How do I add a MIB?
2. How do I add a MIB to the tools?
3. Why can't I see anything from the agent?
4. Why doesn't the agent respond?
5. I can see the system group, but nothing else. Why?
6. Why can't I see values in the <ENTERPRISE> tree?
7. The agent worked for a while, then stopped responding. Why?
8. Requesting an object fails with "Unknown Object Identifier" Why?
9. Why do I get "noSuchName" when asking for "sysUpTime" (or similar)?
10. Why do I sometimes get "End of MIB" when walking a tree, and sometimes not?
11. How do I use SNMPv3?
12. Why can't I set any variables in the MIB?
13. Variables seem to disappear when I try to set them. Why?
14. Why can't I change sysLocation (or sysContact)?
15. I get an error when trying to set a negative value - why?
16. I get an error when trying to query a string-indexed table value - why?
17. How should I specify string-index table values?
18. How do I send traps and notifications?
19. How do I receive traps and notifications?
20. How do I receive SNNMPv1 traps?
21. Why don't I receive incoming traps?
22. My traphandler script doesn't work when run like this - why not?
23. How can the agent receive traps and notifications?
24. How big can an SNMP request (or reply) be?
25. How can I monitor my systems (disk, memory, etc)?
26. Applications complain about entries in your example 'snmp.conf' file. Why?
27. OK, what should I put in snmp.conf?
28. How do I specify IPv6 addresses in tools command line arguments?