They are assigned by MAC address.  Lowest MAC gets eth0.

George


Matt Alexander wrote:
> 
> I remember reading somewhere that Linux assigns each eth device in a
> particular order based on the PCI slot.  I think maybe it was the PCI slot
> closest to the CPU would become eth0 and the next would become eth1, etc.
> I could be completely off about this, however.  In the case of PCMCIA
> cards that you're using, you could try experimenting by swapping them back
> and forth, etc., to see which order it is on your system.  And for PCI
> cards, you could plug one in at a time and configure it before adding the
> next one.
> ~M
> 
> __
> If you're not part of the solution, you're part of the precipitate.
> 
> On Thu, 20 Dec 2001, Eric wrote:
> 
> > With Linux, is there a for-sure way to know whether my top pcmcia slot is
> > eth0 or eth1?  I feel like linux is playing switch-a-roo on me and messing
> > me up.  Is that possible/likely/common?  I had this whole long nice reply to
> > some of the nice comments I received.  While doing so, I accidentally
> > plugged the cables into what "should" have been the wrong physical
> > interfaces on HOST_B, but it turns out everything worked!
> >
> > That is, I plugged HOST_C/10.0.x.x into what "should have been"
> > HOST_B/eth1/192.168.x.x while also "mistakenly" plugging in HOST_B eht0
> > 10.0.x.x into HOST_A 192.168.x.x.  But this all worked, but it "shouldn't"
> > have because of my (mis)understanding as to which physical interface was
> > assinged the logical interfaces eth1 or eth0.  Does that make sense?  How
> > can I tell which is really assigned to which?
> >
> >
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