ing ▁device ' s ▁addresses , ▁it ▁answers ▁on ▁beh alf ▁of ▁the ▁sleep ing ▁device , ▁without ▁w aking ▁it ▁up , ▁giving ▁its ▁own ▁MAC ▁address ▁as ▁the ▁current ▁( tem por ary ) ▁owner ▁of ▁that ▁address . ▁ ▁This ▁may ▁appear ▁confusing ▁to ▁network ▁administr ators ▁who ▁are ▁not ▁expecting ▁the ▁behaviour ▁of ▁changing ▁MAC ▁addresses . ▁ ▁W ire less ▁magic ▁packet ▁▁ ▁In ▁case ▁the ▁low - power - mode ▁device ▁is ▁communic ating ▁via ▁Wi - Fi , ▁the ▁w ake - up - pack et ▁is ▁sent ▁via ▁W ire less ▁Mult imedia ▁Ext ensions ▁( W MM ). ▁ ▁This ▁was ▁not ▁possible ▁in ▁previous ▁implementations ▁of ▁W ake ▁on ▁L AN ▁( W o L ). ▁ ▁The ▁wireless ▁hardware ▁must ▁be ▁updated ▁enough ▁to ▁include ▁W MM ▁support . ▁Apple ▁provides ▁instructions ▁for ▁checking ▁compatibility ▁with ▁this ▁feature ▁for ▁Mac int osh ▁computers . ▁ ▁Support ed ▁services ▁and ▁examples ▁▁ ▁The ▁sleep ▁proxy ▁service ▁is ▁able ▁to ▁advert ise ▁any ▁Bon j our - supported ▁services , ▁while ▁the ▁host ▁computer ▁sle eps . ▁Some ▁examples ▁of ▁supported ▁services ▁are : ▁▁ ▁File ▁sharing : ▁a ▁host ▁supporting ▁the ▁sleep ▁proxy ▁service , ▁which ▁offers ▁file ▁services , ▁may ▁go ▁to ▁sleep ▁as ▁needed . ▁ ▁When ▁someone ▁needs ▁to ▁access ▁shared ▁files , ▁the ▁host ▁will ▁w ake ▁up ▁automatically . ▁ ▁i T unes ▁library ▁sharing : ▁the ▁computer ▁hosting ▁the ▁i T unes ▁library ▁may ▁go ▁to ▁sleep