$snmpwalk -v 2c localhost -c public system
SNMPv2-MIB::sysDescr.0 = STRING: Linux centos-ks 2.6.18-92.el5 #1 SMP Tue Jun 10 18:49:47 EDT 2008 i686
$ snmpwalk -v 2c localhost -c public interfaces
IF-MIB::interfaces = No Such Object available on this agent at this OID
#==Env
NET-SNMP version 5.3.1 Centos 5.2
#=== sample /etc/snmpd/snmpd.conf
- It is important to comment out any default statement above, Because access decision is based on first match.
## sec.name source community
com2sec mynetwork 127.0.0.1 public
com2sec mynetwork 172.16.31.0/24 public
## group.name sec.model sec.name
group MyROGroup v1 mynetwork
group MyROGroup v2c mynetwork
## incl/excl subtree mask
view all included .1
## context sec.model sec.level prefix read write notif
access MyROGroup "" any noauth exact all none none
**Updated: 28 March 2011
The above statements can be simplified as:
rocommunity public 127.0.0.1 .1
rocommunity public 172.16.31.0/24 .1
- Snmpd still starts despite syntax error, it make troubleshooting difficult, But if you start it with DEBUG it will warn you any errors
/usr/sbin/snmpd -LE 7 -p /var/run/snmpd.pid -a
- By default, SNMPD looks for modules in /usr/share/snmp/mibs, The following command will check the loaded module
snmpd -Dmib_init
- If you don't know the OID of an object, snmptranslate can help, The following demostrate how to find objectname and its OID
$ snmptranslate -Ts grep interface .iso.org.dod.internet.mgmt.mib-2.interfaces .iso.org.dod.internet.mgmt.mib-2.interfaces.ifNumber .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifIndex .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifDescr $ snmpget -v 1 localhost -c public interfaces.ifTable.ifEntry.ifDescr.2 IF-MIB::ifDescr.2 = STRING: eth0 $ snmptranslate .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifDescr.2 -On .1.3.6.1.2.1.2.2.1.2.2 $ snmpget -v 1 localhost -c public .1.3.6.1.2.1.2.2.1.2.2 IF-MIB::ifDescr.2 = STRING: eth0
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