Myslim ze to sa da riesit zabalenim do IP paketu, niektore programy na magicpacket to vedia tak poslat (tie u ktorych sa zadava IP). Samotny magicpacket ziadnu IP neobsahuje, len MAC. Ak sa nemylim (takze ak najdes program kde sa da zadat IP tak to vie)

P.S> nieco som nasiel googlom tu
http://www.zive.sk/zobudzame-pc-cez-lan-a-internet /spravy/vsetky-data-na-dosah-zobudzame-pc-cez-inte rnet-alebo-mobil/ch-180464-sc-30-a-272002/default. aspx
mam sice pocit ze autor to poriadne nechape, ale skus sa s tym pohrat aj bez port forwadingu
P.S.2. prip. hladaj googlom pojem subnet directed broadcast, to by mohlo byt lepsie, napr. prvy odkaz googlu http://technet.microsoft.com/en-us/library/bb63280 7.aspx, a v tom pripade "all intervening routers must be configured to forward subnet-directed broadcasts")