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The ESX Server SNMP package takes the simplest approach to SNMP security in the default configuration. It sets up a single community with read-only access. This is denoted by the rocommunity configuration parameter in the configuration file for the master snmpd daemon, snmpd.conf which is set up for you by running snmpsetup.sh default.

By design, SNMP is not a very secure protocol, and the community-based security model is a retrofit to the protocol. There are other enhancements to the SNMP security mechanism that allow an administrator to set up a more elaborate permissions scheme. See the snmpd.conf(5) man page for details.