John,
You will have problems with identical cards, where upon reboot there
is a chance that the assignment between eth1 and eth2 (or in your case eth1,
eth2, eth3, eth4...) will switch on you. It appears that eth(n) is a
logical assignment to the first card that is detected at boot time, and is
therefore independent on the MAC address of the card or what PCI slot that
the card is inserted into. I dont have a good answer for you, a few months
ago a similar question arose and really wasn't answered at that time either.
The question on what algrothim used is a good one.
I'm looking at the source myself to figure it out. Read up on the
PnP stuff and see if this may lead to something else. Sorry no help, but
I'm currently looking into it.
Steve Binyon
-----Original Message-----
From: John Telford [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 09, 2002 2:52 PM
To: redhat-list
Subject: which NIC is which
I'm building routers. It's difficult to tell in advance which NIC will
be assigned eth0 and which will assigned eth1 when using two NICs. Ping
testing usually clears up this simple problem.
The identification problem gets worse when adding a third NIC, after
sorting out the first two NICs. Frequently the eth0 or eth1 assignments
for the first two NICs change.
Of course adding a fourth and fifth NIC multiplies the identification
problem. Yes, some of my routers are supporting five network segments.
My question is, what's the algorithm for assigning Ethernet
designations? I know it not placement order in the PCI bus, and I know
its not the NIC data-link address.
So what is it?
Thanks ...John
--
John Telford - Owner
JohnTelford.com LLC
503-292-6865 - fax:503-292-3094
[EMAIL PROTECTED] - www.johntelford.com
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