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. --- [EMAIL PROTECTED]

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