SNMP configure to use PRTG

Subject: How to configure SNMP in Ubuntu (monitored by PRTG)

Step 1: Install SNMP

Step 2: Configure SNMP

1_ Configure file /etc/snmp/snmpd.conf

Run:
#vi /etc/snmp/snmpd.conf

Un-comment this line:

#  Listen for connections from the local system only
#agentAddress  udp:127.0.0.1:161
#  Listen for connections on all interfaces (both IPv4 *and* IPv6)
agentAddress udp:161,udp6:[::1]:161

Change this line:

#rocommunity public  localhost
                                                 #  Default access to basic system info
 rocommunity nhutcom  

Where "nhutcom" is community string for SNMP target

Change this line:

#rocommunity secret  10.0.0.0/16
rocommunity secret 172.18.72.0/24,172.16.72.0/24,172.18.21.0/24

With 172.18.72.0/24,172.16.72.0/24,172.18.21.0/24 is network we want to allow get SNMP traffic from   

2_ Configure file /etc/default/snmpd

Change this line from:

SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid 127.0.0.1'

To: 

SNMPDOPTS='-Lsd -Lf /dev/null -u snmp -g snmp -I -smux -p /var/run/snmpd.pid'

Just remove 127.0.0.1 at the end of the line.

After done all above step, let check the result, run:

#snmpwalk -v 2c -c <comminity string> localhost

and

#snmpwalk -v 2c -c <string> <IP external of the server>      //snmpwalk -v 2c -c nhutcom 192.168.1.1

And the result should be

SNMPv2-MIB::sysDescr.0 = STRING: Linux blablabla 2.6.18-308.el5 #1 SMP Tue Feb 21 20:05:41 EST 2012 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (15216041) 1 day, 18:16:00.41
SNMPv2-MIB::sysContact.0 = STRING: Root <root@localhost> (configure /etc/snmp/snmp.local.conf)
SNMPv2-MIB::sysName.0 = STRING: blablabla
SNMPv2-MIB::sysLocation.0 = STRING: Unknown (edit /etc/snmp/snmpd.conf)
SNMPv2-MIB::sysORLastChange.0 = Timeticks: (3) 0:00:00.03
SNMPv2-MIB::sysORID.1 = OID: SNMPv2-MIB::snmpMIB
SNMPv2-MIB::sysORID.2 = OID: TCP-MIB::tcpMIB
SNMPv2-MIB::sysORID.3 = OID: IP-MIB::ip
SNMPv2-MIB::sysORID.4 = OID: UDP-MIB::udpMIB
SNMPv2-MIB::sysORID.5 = OID: SNMP-VIEW-BASED-ACM-MIB::vacmBasicGroup
SNMPv2-MIB::sysORID.6 = OID: SNMP-FRAMEWORK-MIB::snmpFrameworkMIBCompliance
SNMPv2-MIB::sysORID.7 = OID: SNMP-MPD-MIB::snmpMPDCompliance
SNMPv2-MIB::sysORID.8 = OID: SNMP-USER-BASED-SM-MIB::usmMIBCompliance
SNMPv2-MIB::sysORDescr.1 = STRING: The MIB module for SNMPv2 entities
SNMPv2-MIB::sysORDescr.2 = STRING: The MIB module for managing TCP implementations
SNMPv2-MIB::sysORDescr.3 = STRING: The MIB module for managing IP and ICMP implementations
SNMPv2-MIB::sysORDescr.4 = STRING: The MIB module for managing UDP implementations
SNMPv2-MIB::sysORDescr.5 = STRING: View-based Access Control Model for SNMP.
SNMPv2-MIB::sysORDescr.6 = STRING: The SNMP Management Architecture MIB.
SNMPv2-MIB::sysORDescr.7 = STRING: The MIB for Message Processing and Dispatching.
SNMPv2-MIB::sysORDescr.8 = STRING: The management information definitions for the SNMP User-based Security Model.
SNMPv2-MIB::sysORUpTime.1 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.2 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.3 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.4 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.5 = Timeticks: (2) 0:00:00.02
SNMPv2-MIB::sysORUpTime.6 = Timeticks: (3) 0:00:00.03
SNMPv2-MIB::sysORUpTime.7 = Timeticks: (3) 0:00:00.03
SNMPv2-MIB::sysORUpTime.8 = Timeticks: (3) 0:00:00.03
HOST-RESOURCES-MIB::hrSystemUptime.0 = Timeticks: (15326821) 1 day, 18:34:28.21
.... And more

And should not : "Timeout: No Response from localhost"

And don't forget to put SNMP deamon to automatically start when system start

One thing, when using snmptester of Paessler to check, the result maybe:

 Just ignore it. Let declare your server into your monitor system.

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DO THE SAME TASK WITH CENTOS

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Setup and configure SNMP in Centos and Ubuntu have some differences:

# yum install net-snmp-utils net-snmp

# up2date -v -i net-snmp-utils net-snmp

# vi /etc/snmp/snmpd.conf

Find the following Line:
com2sec notConfigUser  default       public

Replace with (make sure you replace 192.168.0.0/24 with your network/subnet) the following lines:
com2sec local     localhost           public
com2sec mynetwork 192.168.0.0/24      public

Find Lines:
group   notConfigGroup v1           notConfigUser
group   notConfigGroup v2c           notConfigUser

Replace with:
group MyRWGroup v1         local
group MyRWGroup v2c        local
group MyRWGroup usm        local
group MyROGroup v1         mynetwork
group MyROGroup v2c        mynetwork
group MyROGroup usm        mynetwork

Find line:
view    systemview     included      system

Replace with:
view all    included  .1                               80

Find line:
access  notConfigGroup ""      any       noauth    exact  systemview none none

Replace with:
access MyROGroup ""      any       noauth    exact  all    none   none
access MyRWGroup ""      any       noauth    exact  all    all    none

Find lines:
syslocation Unknown (edit /etc/snmp/snmpd.conf)
syscontact Root  (configure /etc/snmp/snmp.local.conf)

Replace with (make sure you supply appropriate values):
syslocation Linux (RH3_UP2), Home Linux Router.
syscontact YourNameHere <you@example.com>