Victor, : I´m working in a briding enviroment and i want to be sure that my arp : requests outgoing a bridge interface will be hear by only one specific : device (because of security reason) Strange need! Sounds interesting. : are there any way to re-write the ff:ff:ff:ff:ff:ff on this arp request : so they appears like a unicast? I imagine that Julian will jump in here and reply to you, but I thought I'd point you to ip arp, an add-on tool Julian has written for iproute2. http://www.ssi.bg/~ja/#iparp : Do de ip stack understand this "unicast" arp request? Er...um...I don't know. Good question. -Martin -- Martin A. Brown --- SecurePipe, Inc. --- mabrown@xxxxxxxxxxxxxx