From mboxrd@z Thu Jan 1 00:00:00 1970 From: Inaky Perez-Gonzalez Subject: What makes a good fake MAC address? Date: Wed, 22 Apr 2009 13:48:27 -0700 Message-ID: <200904221348.27357.inaky@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from mga10.intel.com ([192.55.52.92]:30355 "EHLO fmsmga102.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757138AbZDVUs2 (ORCPT ); Wed, 22 Apr 2009 16:48:28 -0400 Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: Hi All The Intel i2400m WiMAX driver behaves as an ethernet device, and currently when sending packets to the netdev stack, it fakes an ethernet header, sets the "from" mac address to zeroes and the "to" to it's own MAC address. The WiMAX network can be considered to be a point-to-point (up to the gateway) connection, all IP based, so there are not MAC addresses from our gateway (not to mention that it can change behind us). The problem with using a zero mac address is that it confuses the bridging software (and maybe others). I was wondering, what would be a fake mac address we could put in there that is legal for this kind of "faking"? [or the closest thing to legal?] Thanks! -- Inaky