Date: Mon, 28 Feb 2005 01:40:45 -0800 From: "Ted Mittelstaedt" <tedm@toybox.placo.com> To: "Rob" <spamrefuse@yahoo.com>, <mgrant@grant.org> Cc: FreeBSD questions <freebsd-questions@freebsd.org> Subject: RE: Change MAC address of LAN card in rc.conf. How? Message-ID: <LOBBIFDAGNMAMLGJJCKNOEIOFAAA.tedm@toybox.placo.com> In-Reply-To: <20050228020036.40265.qmail@web54003.mail.yahoo.com>
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> -----Original Message----- > From: owner-freebsd-questions@freebsd.org > [mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Rob > Sent: Sunday, February 27, 2005 6:01 PM > To: mgrant@grant.org > Cc: FreeBSD questions > Subject: Re: Change MAC address of LAN card in rc.conf. How? > > > > --- Michael Grant <michael.grant@gmail.com> wrote: > > > Just curious, why would you ever need to change your > > mac address? > > In my university network, IP numbers must match a > previously registered MAC address, otherwise the IP > number is blocked. So our group has a list of IP > numbers, that each only work with a specific MAC > address. > Yeah, the network admins do that to prevent people spoofing IP addresses to try attacking other computers. Of course, it's stupid since you can spoof the mac and attack away. > When shifting around computers and IP addresses, it > is easier to fake the MAC address to what I need, > than to start a procedure with the computer center > to change the MAC address of a certain IP number. > One of these days you need to start spoofing the mac of the default gateway they are using, and I would suspect after a few weeks or months of that they will jettison the whole register MAC address procedure. Recording the MAC address only has validity when they are assigning a specific MAC to a specific hardware port on the switch by using intelligent switches that filter. But if they are using dumb hubs then they are just being idiots and making work for themselves. > I manage to do this easily on my FreeBSD PCs. > > However, my colleagues are suprised and ask me how > to do this on their MS-Windows systems..... > It's incredibly easy to do, just go into driver properties for just about every network driver ever written for Windows. Of course, this illustrates perfectly the absurdity of continually trying to make computers easier and easier and easier to use with a GUI - no matter how much simpler you make it, the people you are trying to serve will always outrace you in ignorance. Ted
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