Range Based Address Resolution User Guide Configuration of RBAR RBAR Configuration System Options configuration Editing System Options 3.2.7.2 Editing System Options Use this task to edit System Options. Click RBAR, and then Configuration, and then System Options. Update the relevant fields.For more information about each field, see Table 3-7. Click OK, Apply, or Cancel.If OK or Apply is clicked and any of the following conditions exist, an error message appears: Either the Realm or Fully Qualified Domain Name is empty; no value was entered; these fields must be configured as a pair Any required field is empty; no value was entered The entry in any field is not valid (wrong data type or out of the valid range)