I need to monitor the Ethernet interfaces of a Linux VM. This is the perfect job for snmpd which you can get by installing net-snmp and then applying a basic config. Here is a simplified config that will get you basic read-only access for a community and subnet.

# /etc/snmp/snmpd.conf
rocommunity snmp-read 165.92.231.0/24
rocommunity snmp-read 10.3.1.0/24
rocommunity snmp-read localhost
syslocation "City, State"
syscontact  "Admin <user@domain.com>"

You can test your new SNMP configuration with snmpwalk

snmpwalk -v 2c -c snmp-read 127.0.0.1