Re: changing MAC address

[koge () NCSA ES (Antonio Fernandes Vazquez)]

On Fri, 31 Mar 2000, Shehzad Ramzan Ali Khoja wrote

> i believe this is problem with some chipsets ... RealTek NIC dont allow to
> change the MAC address but LanTek cards do ....
>
> .regards

You are right, i tried change MAC in a Realtek 8139, it changes but the
local network got down.
After, with a SIS900 i tryied the same, and all ok, it changes and the
network works well ;)
I think that in Linux, you cant changes MAC when the ethernet card is
already in use.

Salut!
        Antonio Fernandes

> ----- Original Message -----
> From: Antonio Fernandes Vazquez <koge () NCSA ES>
> To: <VULN-DEV () SECURITYFOCUS COM>
> Sent: Thursday, March 30, 2000 3:21 PM
> Subject: Re: changing MAC address
>
>
> > On Wed, 29 Mar 2000, Arturo Busleiman wrote:
> >
> > > This is question regarding an old thread.
> > >
> > > > as an example, under linux, as root:
> > > >
> > > >   ifconfig eth0 hw ether 00:aa:23:ce:3a:11
> > > >
> > > > changes the mac address of eth0 to 00:aa:23:ce:3a:11, iirc.
> > >
> > >         [root@machine /root]# ifconfig eth0 hw ether 00:aa:23:ce:3a:11
> > >         SIOCSIFHWADDR: Device or resource busy
> > >
> > > why does this happen? under which circumstances can I use ifconfig for
> > > that purpose?
> > I'm not totally sure that this purpose with ifconfig will works in every
> > ethernet card, i think that in major this info is written into an ROM.
> > I try to set down the interface and after change it, but not possible in
> > my case, you can read more about this in hacking () argo es. ;)
> >
> > Salut!
> >
> > Antonio Fernandes.