The Book

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=== Configure SNMP on ESXi ===

Login into VMware host using SSH and root credentials, then set community string that you are going to use, and enable SNMP service.

  esxcli system snmp set --communities YOUR_COMMUNITY_STRING
  esxcli system snmp set --enable true

Replace YOUR_COMMUNITY_STRING with the Community string you are going to use, usually this is Private or Public but I think you need to use some unique string one for security reasons.
Enable SNMP on ESXi firewall

Now we need to add a firewall rule to allow inbound SNMP traffic to our ESXi host. For this, we have two options:

1.Allow all traffic for SNMP \\
2.Allow traffic from specific hosts or subnets

=== Allow traffic from All hosts === 

  esxcli network firewall ruleset set --ruleset-id snmp --allowed-all true
  esxcli network firewall ruleset set --ruleset-id snmp --enabled true

=== Allow traffic from specific hosts or subnets === 

  esxcli network firewall ruleset set --ruleset-id snmp --allowed-all false
  esxcli network firewall ruleset allowedip add --ruleset-id snmp --ip-address 192.168.1.0/24
  esxcli network firewall ruleset set --ruleset-id snmp --enabled true

=== Restart SNMP Service === 

Now that we have done our VMware 6.5 SNMP configuration we need to restart the SNMP service

  /etc/init.d/snmpd restart


  esxcli system snmp set --communities public
  esxcli system snmp set --enable true
  esxcli network firewall ruleset set --ruleset-id snmp --allowed-all false
  esxcli network firewall ruleset allowedip add --ruleset-id snmp --ip-address 10.0.2.0/24
  esxcli network firewall ruleset set --ruleset-id snmp --enabled true
  /etc/init.d/snmpd restart