On Thu, Aug 05, 2004 at 06:01:53PM +0200, Mipam wrote:
> I'm having trouble understanding the link0 or link1 for example argument
> in ifconfig if the nic supports it.

man ifconfig, search for link[0-2]:

     link[0-2]       Enable special processing of the link level of the inter-
                     face.  These three options are interface specific in
                     actual effect, however, they are in general used to
                     select special modes of operation.  An example of this is
                     to enable SLIP compression, or to select the connector
                     type for some ethernet cards.  Refer to the man page for
                     the specific driver for more information.

You can find an example of it's use in man ippp.

Short summary: it is up to the device driver how to use that flags, and few
drivers do use them.

Martin