Description: This table defines the state of the firewall on
    individual interfaces.  The firewall may be enabled
    or disabled for each interface on the device.  The effective
    state of the firewall depends on the setting of
    etsysFWFirewallEnabled.


                       |                              | interface
etsysFWFirewallEnabled | etsysFWFirewallOnIntfEnabled | effective
                       |                              |   state
-----------------------------------------------------------------
      true                         true                  enabled
      true                         false                 disabled
      false                        true                  disabled
      false                        false                 disabled

    If an interface is not represented in this table, then its
    effective state is determined by etsysFWFirewallEnabled.

    The implementation may choose to allow modifications to this
    table only under certain SNMP contexts.  The
    etsysFWFirewallOnIntfStorageType for a given SNMP context may
    be readOnly, meaning the row cannot be modified or deleted. In
    another SNMP context, the etsysFWFirewallOnIntfStorageType
    value could allow the row to be modified or deleted.