Ok I finally decide to install linux and everything wet well besides some partitions issues that I already solved. Now I'm trying to get the net to work.
My problem is that I while back I had serious problems with my connection and my ISP gave me a static (fixed) IP address, and that solved the problem. In the process the made me change the MAC address of the NIC on W XP, wich is very simple, and told me not to change it or my IP will change also. I found that If I change the MAC adress from NIC my ISP don't give me service. So now the wuastion is, how can I set up my NIc on linux? (Slackware 9.1) I tried netconfig and DHCP (wich should be the correct option) detects everything but since my MAC address is not the same my IP is diferent and I cant surf the web. I tryed to change it using ifconfigeth0 hw ether <MAC adress> but it doesn't work.
Any Idea? maybe I missed something? thanks in advance

well the proper way of doing it is :
ifconfig eth0 hw ether 00:aa:22:cc:33:bb

which apparently you say doesn't work ... is there an error ?
or does it just not change ? are you doing it as root ?

I found this program... http://www.alobbs.com/modules.php?op...acc&file=index
Never used it or heard of it before, so no recomendations on my behalf.

I found one site where someone said the command to be this: ifconfig eth0 hwaddr ether 00:11:22:33:44:55 . Slightly different, but who knows.

From the ifconfig man page (under options):

hw class address
Set the hardware address of this interface, if the device driver sup-
ports this operation. The keyword must be followed by the name of the
hardware class and the printable ASCII equivalent of the hardware
address. Hardware classes currently supported include ether (Ethernet),
ax25 (AMPR AX.25), ARCnet and netrom (AMPR NET/ROM).

Hope this helps. From your post, there should be a space between ifconfig and eth0, but that's probably just a typo in the post?

You can not change the MAC address on serveral NICs because they are hardcoded. Few NICs can change their MAC address with out any trouble. Try asking your NIC manufacture if they have an utility to change the MAC address for your NIC.

What Windows XP does it ignores the MAC address of your NIC and uses its software MAC address instead. LINUX does the same way but the module (driver) have to support faking hardware MAC address.

You can get a router that can change its MAC address then you do not have to worry about all the computers on your network.

The IP address is different than the MAC address. The IP address can be changed but the MAC address is the true identity of your computer on the network. Your ISP is incorrect stating that having a different MAX address changes IP address. What they should of said we use the MAC address to make sure that only subscribe owners can have access to our internet service.