To configure snmp on Redhat/centos, you first need to install the snmpd package using the command :
yum install net-snmp
Then edit the configuration file :
nano /etc/snmp/snmpd.conf
add the line :
rocommunity public
Next, restart the SNMP service by typing :
service snmpd restart
If the service does not respond to the SNMP request and you get an error of this type, in your log file : /var/log/messages
Dec 8 07:13:47 era snmpd[19465]: Connection from UDP: [10.10.0.149]:56275->[10.15.0.1]:161 REFUSEDSimply edit the host.allow file
nano /etc/hosts.allow
file and add a line like this : snmpd: <votre ip>for example :
snmpd: 10.10.0.149
Next, you need to restart the SNMP service:
service snmpd restart