I saw this problem when a box was installed with the TG3 driver, and 
upgraded to the broadcom BCM5700 driver.  TG3 uses MAC address to 
determine the order, and BCM enumerates via PCI bus.  Needless to say, 
that caused a bit of a problem :)

George Toft, CISSP, MSIS
623-203-1760




Kenneth wrote:
> Hoping someone knows this one, to save me what would probably turn into a
> couple of days of research to satisfy my curiosity :)
> 
> I have been running Gentoo for a while, and this machine is my router and
> firewall. It has two ethernet controllers in it.  When I first installed, it
> called the controller I wanted to be eth0, eth1 and vice versa (I know it
> doesn't really matter, but it's a personal idiosyncracy).  I placed the names
> for the modules in the /etc/modules.autoload.d/kernel-2.6 file, with the one
> I wanted to be eth0 first, and that got them in my preferred order so I
> assumed that the first loaded module would be eth0.
> 
> Well after an update the other day, the two swapped places and I wasn't able
> to get them back, so finally just left them.  It wasn't all bad, I discovered
> a bug in my firewall setup script when it failed, but I'm curious what
> decides which controller is which, and how it could change on it's own.
> 
> 
> 
>  
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