Com2sec
From Net-SNMP Wiki
com2sec
The basic structure of the com2sec label is
# sec.name source community
sec.name is an arbitrary word that is used by the group label. source describes a host or network. And community is the community name that is used.
Examples
com2sec localhost 127.0.0.1 public com2sec local 192.168.0.0/24 netsnmp com2sec trusted 192.168.1.1 secretWord
source can be the word default, but it is not clear what this means.