4 Replies Latest reply on Aug 9, 2010 8:57 AM by byrona

Trying to poll a very dumb linux box running mini_snmpd

GaryP Aug 6, 2010 9:36 AM

Afternoon all, got a little bit of a problem I've been scratching my head over. I'm trying to monitor a linux router, namely a Linksys WRT54GL running OpenWRT Backfire 10.03 (it's my home router, I run the University's Solarwinds install so I figure they can spare the licensing and cycles to monitor one extra little box ). Now these systems have limited RAM (32MB, hah, I remember when I aspired to having that much in my workstation!) so I'm running a cut-down implementation of net-snmp called mini_snmpd (http://members.aon.at/linuxfreak/linux/mini_snmpd.html) that uses ~10% of the memory of net-snmp.

The daemon's all up and running quite happily with one of our NPM pollers talking to it but doing a 'list resources' only shows me the network interfaces of the device, no CPU, RAM or disk usage. Doing an snmpwalk at it, curiously, gives me exactly the same result unless I specify '.iso' as the starting point in the MIB to make the walk from, in which case I get everything I would hope for.

It may be worth noting that mini_snmpd doesn't return a 'machine type' when it's polled so NPM has no idea what type of machine it is (it shows up as 'Unknown').

So, the question is: how do I do the equivalent of 'snmpwalk -v 2c -c public <host> .iso' when I add it to NPM, or 'List resources', to enable it to see the additional devices/resources?

Re: Trying to poll a very dumb linux box running mini_snmpd

byrona Aug 6, 2010 9:52 AM (in response to GaryP)

I am not familiar with mini_snmpd, only net-snmp. Are there any configurations you can make to the mini_snmpd that will allow you to get rid of the required .iso? I am guessing that if that wasn't required things would be working as you would like.

Re: Trying to poll a very dumb linux box running mini_snmpd

bshopp Aug 6, 2010 4:15 PM (in response to byrona)

byrona is right, can you determine a way to remove the .iso requirement then it should work fine. Regarding unknown search thwack for the tell us you unknown devices post and put up there the requested info and we will add it to our discovery DB so it will become recognized

Re: Trying to poll a very dumb linux box running mini_snmpd

GaryP Aug 9, 2010 3:22 AM (in response to bshopp)

Interestingly, from the SNMP FAQ, this appears to be correct behaviour:

http://net-snmp.sourceforge.net/docs/FAQ.html#Why_can_t_I_see_values_in_the__INSERT_ENTERPRISE_HERE__tree_

  By default, unless given an explicit starting OID, then the 'snmpwalk'
  command will display the contents of the 'mib-2' tree, containing most
  of the IETF-standard management information supported by the agent.
  When the agent reaches the end of this tree, it will return the first
  enterprise-specific value, and 'snmpwalk' will recognise that this
  marks the end of the (implicitly) request tree, and stop.  No
  enterprise-specific information will be displayed.

    To walk the whole tree, and see *all* the information that the
  agent supports, specify a starting point of '.iso' or '.1'.

Compare the out from the two commands (with and without .iso specified as the starting point):

root@kahlua:~# snmpwalk -v 2c -c not_public localhost:1161
Cannot find module (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none)
Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none)
Cannot find module (SNMP-FRAMEWORK-MIB): At line 0 in (none)
Cannot find module (SNMP-MPD-MIB): At line 0 in (none)
Cannot find module (SNMP-USER-BASED-SM-MIB): At line 0 in (none)
Cannot find module (TUNNEL-MIB): At line 0 in (none)
Cannot find module (IPV6-FLOW-LABEL-MIB): At line 0 in (none)
Cannot find module (UCD-DLMOD-MIB): At line 0 in (none)
Cannot find module (IP-MIB): At line 0 in (none)
Cannot find module (IF-MIB): At line 0 in (none)
Cannot find module (TCP-MIB): At line 0 in (none)
Cannot find module (UDP-MIB): At line 0 in (none)
Cannot find module (HOST-RESOURCES-MIB): At line 0 in (none)
Cannot find module (SNMPv2-MIB): At line 0 in (none)
Cannot find module (SNMPv2-SMI): At line 0 in (none)
Cannot find module (NOTIFICATION-LOG-MIB): At line 0 in (none)
Cannot find module (DISMAN-EVENT-MIB): At line 0 in (none)
Cannot find module (DISMAN-SCHEDULE-MIB): At line 0 in (none)
iso.3.6.1.2.1.1.1.0 = STRING: "WRT54GL"
iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1
iso.3.6.1.2.1.1.3.0 = Timeticks: (23799496) 2 days, 18:06:34.96
iso.3.6.1.2.1.1.4.0 = STRING: "garyp@XXXXXXXX.XXX.XX"
iso.3.6.1.2.1.1.5.0 = STRING: "XXXXXX.XXX.XX"
iso.3.6.1.2.1.1.6.0 = STRING: "Nottingham"
iso.3.6.1.2.1.2.1.0 = INTEGER: 4
iso.3.6.1.2.1.2.2.1.1.1 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.1.2 = INTEGER: 2
iso.3.6.1.2.1.2.2.1.1.3 = INTEGER: 3
iso.3.6.1.2.1.2.2.1.1.4 = INTEGER: 4
iso.3.6.1.2.1.2.2.1.2.1 = STRING: "eth0.0"
iso.3.6.1.2.1.2.2.1.2.2 = STRING: "eth0.1"
iso.3.6.1.2.1.2.2.1.2.3 = STRING: "wlan0"
iso.3.6.1.2.1.2.2.1.2.4 = STRING: "aiccu"
iso.3.6.1.2.1.2.2.1.8.1 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.8.2 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.8.3 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.8.4 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.10.1 = Counter32: 36798180
iso.3.6.1.2.1.2.2.1.10.2 = Counter32: 966905617
iso.3.6.1.2.1.2.2.1.10.3 = Counter32: 37245385
iso.3.6.1.2.1.2.2.1.10.4 = Counter32: 4294766160
iso.3.6.1.2.1.2.2.1.11.1 = Counter32: 456680
iso.3.6.1.2.1.2.2.1.11.2 = Counter32: 1409092
iso.3.6.1.2.1.2.2.1.11.3 = Counter32: 301034
iso.3.6.1.2.1.2.2.1.11.4 = Counter32: 4294957819
iso.3.6.1.2.1.2.2.1.13.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.13.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.13.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.13.4 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.4 = Counter32: 0
iso.3.6.1.2.1.2.2.1.16.1 = Counter32: 659684634
iso.3.6.1.2.1.2.2.1.16.2 = Counter32: 118870273
iso.3.6.1.2.1.2.2.1.16.3 = Counter32: 296916810
iso.3.6.1.2.1.2.2.1.16.4 = Counter32: 4290436743
iso.3.6.1.2.1.2.2.1.17.1 = Counter32: 799222
iso.3.6.1.2.1.2.2.1.17.2 = Counter32: 1074101
iso.3.6.1.2.1.2.2.1.17.3 = Counter32: 362267
iso.3.6.1.2.1.2.2.1.17.4 = Counter32: 4294940597
iso.3.6.1.2.1.2.2.1.19.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.19.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.19.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.19.4 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.4 = Counter32: 0
iso.3.6.1.2.1.25.1.1.0 = Timeticks: (57377011) 6 days, 15:22:50.11

root@kahlua:~# snmpwalk -v 2c -c not_public localhost:1161 .iso
Cannot find module (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none)
Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none)
Cannot find module (SNMP-FRAMEWORK-MIB): At line 0 in (none)
Cannot find module (SNMP-MPD-MIB): At line 0 in (none)
Cannot find module (SNMP-USER-BASED-SM-MIB): At line 0 in (none)
Cannot find module (TUNNEL-MIB): At line 0 in (none)
Cannot find module (IPV6-FLOW-LABEL-MIB): At line 0 in (none)
Cannot find module (UCD-DLMOD-MIB): At line 0 in (none)
Cannot find module (IP-MIB): At line 0 in (none)
Cannot find module (IF-MIB): At line 0 in (none)
Cannot find module (TCP-MIB): At line 0 in (none)
Cannot find module (UDP-MIB): At line 0 in (none)
Cannot find module (HOST-RESOURCES-MIB): At line 0 in (none)
Cannot find module (SNMPv2-MIB): At line 0 in (none)
Cannot find module (SNMPv2-SMI): At line 0 in (none)
Cannot find module (NOTIFICATION-LOG-MIB): At line 0 in (none)
Cannot find module (DISMAN-EVENT-MIB): At line 0 in (none)
Cannot find module (DISMAN-SCHEDULE-MIB): At line 0 in (none)
iso.3.6.1.2.1.1.1.0 = STRING: "WRT54GL"
iso.3.6.1.2.1.1.2.0 = OID: iso.3.6.1.4.1
iso.3.6.1.2.1.1.3.0 = Timeticks: (23800609) 2 days, 18:06:46.09
iso.3.6.1.2.1.1.4.0 = STRING: "garyp@XXXXXXXX.XXX.XX"
iso.3.6.1.2.1.1.5.0 = STRING: "XXXXXX.XXX.XX"
iso.3.6.1.2.1.1.6.0 = STRING: "Nottingham"
iso.3.6.1.2.1.2.1.0 = INTEGER: 4
iso.3.6.1.2.1.2.2.1.1.1 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.1.2 = INTEGER: 2
iso.3.6.1.2.1.2.2.1.1.3 = INTEGER: 3
iso.3.6.1.2.1.2.2.1.1.4 = INTEGER: 4
iso.3.6.1.2.1.2.2.1.2.1 = STRING: "eth0.0"
iso.3.6.1.2.1.2.2.1.2.2 = STRING: "eth0.1"
iso.3.6.1.2.1.2.2.1.2.3 = STRING: "wlan0"
iso.3.6.1.2.1.2.2.1.2.4 = STRING: "aiccu"
iso.3.6.1.2.1.2.2.1.8.1 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.8.2 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.8.3 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.8.4 = INTEGER: 1
iso.3.6.1.2.1.2.2.1.10.1 = Counter32: 36798180
iso.3.6.1.2.1.2.2.1.10.2 = Counter32: 966911883
iso.3.6.1.2.1.2.2.1.10.3 = Counter32: 37245385
iso.3.6.1.2.1.2.2.1.10.4 = Counter32: 4294770696
iso.3.6.1.2.1.2.2.1.11.1 = Counter32: 456680
iso.3.6.1.2.1.2.2.1.11.2 = Counter32: 1409163
iso.3.6.1.2.1.2.2.1.11.3 = Counter32: 301034
iso.3.6.1.2.1.2.2.1.11.4 = Counter32: 4294957889
iso.3.6.1.2.1.2.2.1.13.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.13.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.13.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.13.4 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.14.4 = Counter32: 0
iso.3.6.1.2.1.2.2.1.16.1 = Counter32: 659684634
iso.3.6.1.2.1.2.2.1.16.2 = Counter32: 118882511
iso.3.6.1.2.1.2.2.1.16.3 = Counter32: 296916810
iso.3.6.1.2.1.2.2.1.16.4 = Counter32: 4290446587
iso.3.6.1.2.1.2.2.1.17.1 = Counter32: 799222
iso.3.6.1.2.1.2.2.1.17.2 = Counter32: 1074164
iso.3.6.1.2.1.2.2.1.17.3 = Counter32: 362267
iso.3.6.1.2.1.2.2.1.17.4 = Counter32: 4294940660
iso.3.6.1.2.1.2.2.1.19.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.19.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.19.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.19.4 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.1 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.2 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.3 = Counter32: 0
iso.3.6.1.2.1.2.2.1.20.4 = Counter32: 0
iso.3.6.1.2.1.25.1.1.0 = Timeticks: (57378124) 6 days, 15:23:01.24
iso.3.6.1.4.1.2021.4.5.0 = INTEGER: 29660
iso.3.6.1.4.1.2021.4.6.0 = INTEGER: 9984
iso.3.6.1.4.1.2021.4.13.0 = INTEGER: 0
iso.3.6.1.4.1.2021.4.14.0 = INTEGER: 1440
iso.3.6.1.4.1.2021.4.15.0 = INTEGER: 8848
iso.3.6.1.4.1.2021.9.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.2021.9.1.2.1 = STRING: "/tmp"
iso.3.6.1.4.1.2021.9.1.6.1 = INTEGER: 14832
iso.3.6.1.4.1.2021.9.1.7.1 = INTEGER: 13516
iso.3.6.1.4.1.2021.9.1.8.1 = INTEGER: 1316
iso.3.6.1.4.1.2021.9.1.9.1 = INTEGER: 9
iso.3.6.1.4.1.2021.9.1.10.1 = INTEGER: 2
iso.3.6.1.4.1.2021.10.1.1.1 = INTEGER: 1
iso.3.6.1.4.1.2021.10.1.1.2 = INTEGER: 2
iso.3.6.1.4.1.2021.10.1.1.3 = INTEGER: 3
iso.3.6.1.4.1.2021.10.1.2.1 = STRING: "Load-1"
iso.3.6.1.4.1.2021.10.1.2.2 = STRING: "Load-5"
iso.3.6.1.4.1.2021.10.1.2.3 = STRING: "Load-15"
iso.3.6.1.4.1.2021.10.1.3.1 = STRING: "0.00"
iso.3.6.1.4.1.2021.10.1.3.2 = STRING: "0.00"
iso.3.6.1.4.1.2021.10.1.3.3 = STRING: "0.00"
iso.3.6.1.4.1.2021.10.1.4.1 = STRING: "1"
iso.3.6.1.4.1.2021.10.1.4.2 = STRING: "5"
iso.3.6.1.4.1.2021.10.1.4.3 = STRING: "15"
iso.3.6.1.4.1.2021.10.1.5.1 = INTEGER: 0
iso.3.6.1.4.1.2021.10.1.5.2 = INTEGER: 0
iso.3.6.1.4.1.2021.10.1.5.3 = INTEGER: 0
iso.3.6.1.4.1.2021.11.50.0 = Counter32: 1568083
iso.3.6.1.4.1.2021.11.51.0 = Counter32: 0
iso.3.6.1.4.1.2021.11.52.0 = Counter32: 290526
iso.3.6.1.4.1.2021.11.53.0 = Counter32: 55357269
iso.3.6.1.4.1.2021.11.59.0 = Counter32: 157015882
iso.3.6.1.4.1.2021.11.60.0 = Counter32: 23672858
iso.3.6.1.4.1.99999.1.0 = INTEGER: 1152336530
iso.3.6.1.4.1.99999.2.0 = INTEGER: 709772394
iso.3.6.1.4.1.99999.2.0 = No more variables left in this MIB View (It is past the end of the MIB tree)

Re: Trying to poll a very dumb linux box running mini_snmpd

byrona Aug 9, 2010 8:57 AM (in response to GaryP)

From this it looks like it is suggesting that this is normal behavior for all of net-snmp; however, we use net-snmp here without any issue.
I wonder if this is new?
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