Setup:SNMPConfiguration

From Wiki Centreon

The following image shows the default snmpd configuration on a Debian/Ubuntu system. The relationship between community, security group, access rights and accessable trees is shown with red boxes.

To make the default service checks for the centreon server in the initial Centreon configuration work, it might be necessary to adjust the security settings. In the above screenshot example access by community "public" is restricted to only a few information from the .iso.org.dod.internet.mgmt.mib-2.system (.1.3.6.1.2.1.1) subtree. But all the centreon plugins check_centreon_snmp_* need access to .iso.org.dod.internet.mgmt.mib-2 (.1.3.6.1.2.1) for all resources (.25 for HostResources, .6 for Interface statistics). You can either choose the more secure path and add a second community setting (c3ntr3on in the image) with access to the whole OID tree or change the sec.name for the public community from paranoid to public. But be aware, that everyone can read information about your server with the well known default community string "public".

In the first case of adding an additional community, you will also have to change the default global SNMP community in Centreon by changing the value of variable $USER2$ in resources. You can find it in "Configuration" -> "Nagios" -> "resources".