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	[x] Attachment Details

SNMP Error

Zone: Linux Administration

Tags: problem, snmpwalk, mrtg, snmpd, snmp

I recently set up MRTG on my server and it is working fine so far for every host I try except localhost.

I did not have snmpd installed, but now do. I used apt-get to install snmpd and left the config as it comes except for this part:

# sec.name source community
com2sec paranoid default public
com2sec readonly default public
#com2sec readwrite default private

I uncommented the readonly line after I had problems. The rest of the config file is still default, meaning most of it is commented out.

A walk of localhost produces this:
10hz:/home/mrtg# snmpwalk -Os -c public -v 1 localhost system

sysDescr.0 = STRING: Linux 10hz 2.6.18-5-486 #1 Mon Dec 24 16:04:42 UTC 2007 i686
sysObjectID.0 = OID: netSnmpAgentOIDs.10
sysUpTimeInstance = Timeticks: (351264) 0:58:32.64
sysContact.0 = STRING: Root <root@localhost> (configure /etc/snmp/snmpd.local.conf)
sysName.0 = STRING: 10hz
sysLocation.0 = STRING: Unknown (configure /etc/snmp/snmpd.local.conf)
sysORLastChange.0 = Timeticks: (27) 0:00:00.27
sysORID.1 = OID: ifMIB
sysORID.2 = OID: snmpMIB
sysORID.3 = OID: tcpMIB
sysORID.4 = OID: ip
sysORID.5 = OID: udpMIB
sysORID.6 = OID: vacmBasicGroup
sysORID.7 = OID: snmpFrameworkMIBCompliance
sysORID.8 = OID: snmpMPDCompliance
sysORID.9 = OID: usmMIBCompliance
sysORDescr.1 = STRING: The MIB module to describe generic objects for network interface sub-layers
sysORDescr.2 = STRING: The MIB module for SNMPv2 entities
sysORDescr.3 = STRING: The MIB module for managing TCP implementations
sysORDescr.4 = STRING: The MIB module for managing IP and ICMP implementations
sysORDescr.5 = STRING: The MIB module for managing UDP implementations
sysORDescr.6 = STRING: View-based Access Control Model for SNMP.
sysORDescr.7 = STRING: The SNMP Management Architecture MIB.
sysORDescr.8 = STRING: The MIB for Message Processing and Dispatching.
sysORDescr.9 = STRING: The management information definitions for the SNMP User-based Security Model.
sysORUpTime.1 = Timeticks: (27) 0:00:00.27
sysORUpTime.2 = Timeticks: (27) 0:00:00.27
sysORUpTime.3 = Timeticks: (27) 0:00:00.27
sysORUpTime.4 = Timeticks: (27) 0:00:00.27
sysORUpTime.5 = Timeticks: (27) 0:00:00.27
sysORUpTime.6 = Timeticks: (27) 0:00:00.27
sysORUpTime.7 = Timeticks: (27) 0:00:00.27
sysORUpTime.8 = Timeticks: (27) 0:00:00.27
sysORUpTime.9 = Timeticks: (27) 0:00:00.27
End of MIB

When I walk a working computer, I get this:
10hz:/etc/snmp# snmpwalk -Os -c public -v 1 192.168.0.69 system
sysDescr.0 = STRING: Hardware: x86 Family 15 Model 107 Stepping 1 AT/AT COMPATIBLE - Software: Windows 2000 Version 5.1 (Build 2600 Multiprocessor Free)
sysObjectID.0 = OID: enterprises.311.1.1.3.1.1
sysUpTimeInstance = Timeticks: (824795) 2:17:27.95
sysContact.0 = STRING:
sysName.0 = STRING: 20HZ
sysLocation.0 = STRING:
sysServices.0 = INTEGER: 76

I've found this problem out there a great many times, but not a solution so far. Surely it's just a config change that needs made in the config maybe?

Thanks in advance!

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Question Stats

Zone: OS

Question Asked By: archaic0

Solution Provided By: decoleur

Participating Experts: 1

Solution Grade: A

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Comment by decoleur

thanks, if I could add my 2 cents on your conclusions...

I think they were spot on, the second part is where you tie a "security model" with a version of snmp (v1, v2c, usm aka v3) and the type of access (RO or RW). The third is where you explicitely define how the security model is authenticated and what resources it has access to. You could use this if you wanted to set up a monitor that only had access to a restricted set of information.

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Comment by archaic0

Yeah, things always make more sense once you figure them out, I should post my own tutorial on how to get MRTG working and make sure to include this part about getting SNMP to work on a linux box. Maybe it's just debian that defaults this way. I know in previous years the defaults were good enough because the last time I set up MRTG I didn't have a single problem with monitoring the localhost and all I did was apt-get snmpd. I guess they've opted for a more secure default now. I guess that's better... right?

Thanks again for your help.

20080723-EE-VQP-34 / EE_QW_Related_20080208