From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <451cb301050330024578b71d2b@mail.gmail.com> Date: Wed, 30 Mar 2005 13:45:40 +0300 From: McLone To: fgergo@gmail.com, Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu> Subject: Re: [9fans] unique MAC address allocation? In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit References: Cc: Topicbox-Message-UUID: 2e35fad2-ead0-11e9-9d60-3106f5b1d025 On Wed, 30 Mar 2005 12:25:27 +0200, fgergo@gmail.com wrote: > 1. does anybody know if and how MAC addresses are allocated to network > card manufacturers? trere was some comitee that allocates to manufacturers different MAC prefixes. > 2. do manufacturers guarantee the uniqueness of MAC addresses they build? true > 3. is it still true (was it ever true), that if I bought 2 NIC's, > they'll have different MAC addresses? true [ for not very old ethernet cards] > 4. is it the responsibility of the OS to override the default MAC > address if another card with the same (possibly overriden) MAC address > was present on the LAN? As far as i know, driver must allow this, and this process isn't automatic. Only modern drivers allow MAC override [read: win32, nvidia nforce, and wireless :-] -- wbr, |\ _,,,---,,_ dog bless ya! ` Zzz /,`.-'`' -. ;-;;,_ McLone at GMail dot com |,4- ) )-,_. ,\ ( `'-' net- and *BSD admin '---''(_/--' `-'\_) ...sorry for translit