FAQ:Applications 25

How do I specify IPv6 addresses on the command line?

IPv6 addresses pose a particular problem for the Net-SNMP command line tools, which parse host names into pieces. In particular, normally if you specify a simple host name, it assumes you want UDP in IPv4 on port 161. IE, these two commands are actually the same (by default):

 snmpget 127.0.0.1 sysUpTime.0
 snmpget udp:127.0.0.1:161 sysUpTime.0

However, for IPv6 this causes a problem because IPv6 addresses also use a colon to separate addressing parts. Thus you need to enclose the address in square brackets ( [ and ] ). Because most shells use these brackets too, you also likely need to quote it:

 snmpget 'udp6:[::1]:161' sysUpTime.0

   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?