# File lib/simp/cli/config/items/data/cli_network_netmask.rb, line 21
    def os_value
      netmask = nil
      nic = get_item( 'cli::network::interface' ).value
      if nic || @fact
        @fact = @fact || "netmask_#{nic}"
        netmask = super
        if netmask.nil? and !@__warning
          warning = "WARNING: #{@key}: No Netmask found for NIC #{nic}"
          warn( warning, [:YELLOW] )
          @__warning = true
        end
      end
      netmask
    end