Minimal SNMP Daemon (mini_snmpd) configuration

The mini_snmpd configuration is located in /etc/config/mini_snmpd. This configuration is responsible for defining basic snmp attributes, such as location, contact, community and snmp tables for disks and interfaces. This daemon reports only 32bit counters (Counter32).

Sections

Configuration consists of single section called mini_snmpd.

The default configuration defines following settings: 

config mini_snmpd
        option enabled          '0'
        option ipv6             '0'
        option community        'public'
        option location         ' '
        option contact          ' '
        list disks              '/tmp'
        list disks              '/jffs'
        list interfaces         'lo'
        list interfaces         'br-lan'
        list interfaces         'br-wan' # Max 4
  • enabled defines if daemon should be started on by rc script
  • ipv6 enables daemon's support of ipv6 sockets - it will listen on :::161 instead of 0.0.0.0:161
  • community sets SNMP community string
  • location and contact set those base SNMP attributes
  • disks and interfaces specifies which filesystems and interfaces should be referenced by corresponding management tables.
  • sysName is set automatically from the Hostname on the main System page of the web GUI
Name Type Required Default Description
enabled boolean yes 0 Switches daemon on or off in rc (init.d) script
ipv6 boolean no 0 Enables daemon's support of ipv6 sockets
community string yes public Sets SNMP Community string to contact this agent
location string no (none) If defined, sets location OID which mini_snmpd reports
contact string no (none) If defined, sets contact OID wchi mini_snmpd reports
disks list of filesystems' mountpoints no (none) If defined, mini_snmpd includes this filesystem in output table
interfaces list of network interfaces no (none) If defined, mini_snmpd includes this interfaces in output table

Examples

Simple example: enable daemon, excluding ipv6 support, defining other parameters. 

config mini_snmpd
	option enabled 1
	option ipv6 0
	option community public
	option location ''
	option contact ''
	option disks '/tmp,/jffs'
	option interfaces 'wlan0,br-lan,eth0.1,eth0' # Max 4

Example of the snmpwalk: 

$ snmpwalk -m ALL -v 2c -c public 192.168.1.1 
SNMPv2-MIB::sysDescr.0 = STRING: 
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (17915) 0:02:59.15
SNMPv2-MIB::sysContact.0 = STRING: 
SNMPv2-MIB::sysName.0 = STRING: OpenWrt
SNMPv2-MIB::sysLocation.0 = STRING: 
RFC1213-MIB::ifNumber.0 = INTEGER: 4
RFC1213-MIB::ifIndex.1 = INTEGER: 1
RFC1213-MIB::ifIndex.2 = INTEGER: 2
RFC1213-MIB::ifIndex.3 = INTEGER: 3
RFC1213-MIB::ifIndex.4 = INTEGER: 4
RFC1213-MIB::ifDescr.1 = STRING: "wlan0"
RFC1213-MIB::ifDescr.2 = STRING: "br-lan"
RFC1213-MIB::ifDescr.3 = STRING: "eth0.1"
RFC1213-MIB::ifDescr.4 = STRING: "eth0"
RFC1213-MIB::ifOperStatus.1 = INTEGER: up(1)
RFC1213-MIB::ifOperStatus.2 = INTEGER: up(1)
RFC1213-MIB::ifOperStatus.3 = INTEGER: up(1)
RFC1213-MIB::ifOperStatus.4 = INTEGER: up(1)
RFC1213-MIB::ifInOctets.1 = Counter32: 19574486
RFC1213-MIB::ifInOctets.2 = Counter32: 18252147
RFC1213-MIB::ifInOctets.3 = Counter32: 124204634
RFC1213-MIB::ifInOctets.4 = Counter32: 126247040
RFC1213-MIB::ifInUcastPkts.1 = Counter32: 91002
RFC1213-MIB::ifInUcastPkts.2 = Counter32: 90354
RFC1213-MIB::ifInUcastPkts.3 = Counter32: 113467
RFC1213-MIB::ifInUcastPkts.4 = Counter32: 113467
RFC1213-MIB::ifInDiscards.1 = Counter32: 0
RFC1213-MIB::ifInDiscards.2 = Counter32: 0
RFC1213-MIB::ifInDiscards.3 = Counter32: 0
RFC1213-MIB::ifInDiscards.4 = Counter32: 0
RFC1213-MIB::ifInErrors.1 = Counter32: 0
RFC1213-MIB::ifInErrors.2 = Counter32: 0
RFC1213-MIB::ifInErrors.3 = Counter32: 0
RFC1213-MIB::ifInErrors.4 = Counter32: 0
RFC1213-MIB::ifOutOctets.1 = Counter32: 127834842
RFC1213-MIB::ifOutOctets.2 = Counter32: 125363371
RFC1213-MIB::ifOutOctets.3 = Counter32: 19332841
RFC1213-MIB::ifOutOctets.4 = Counter32: 20197296
RFC1213-MIB::ifOutUcastPkts.1 = Counter32: 112239
RFC1213-MIB::ifOutUcastPkts.2 = Counter32: 111021
RFC1213-MIB::ifOutUcastPkts.3 = Counter32: 85992
RFC1213-MIB::ifOutUcastPkts.4 = Counter32: 88600
RFC1213-MIB::ifOutDiscards.1 = Counter32: 0
RFC1213-MIB::ifOutDiscards.2 = Counter32: 0
RFC1213-MIB::ifOutDiscards.3 = Counter32: 0
RFC1213-MIB::ifOutDiscards.4 = Counter32: 0
RFC1213-MIB::ifOutErrors.1 = Counter32: 0
RFC1213-MIB::ifOutErrors.2 = Counter32: 0
RFC1213-MIB::ifOutErrors.3 = Counter32: 0
RFC1213-MIB::ifOutErrors.4 = Counter32: 0
HOST-RESOURCES-MIB::hrSystemUptime.0 = Timeticks: (1547471) 4:17:54.71"

As you see walk doesn't catch on disks for some reason.

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  • Last modified: 2019/08/26 11:35
  • by vgaetera