[ale] eth numbering change

[Brian Stanaland]

There were no udev rules in place. We set that up so the NICs were named
the way they wanted. It's possible that the motherboards were from
different production runs. The wired order of the slots isn't something we
would specify.

That answers the question for me.

Thanks,
Brian


On Wed, Feb 8, 2017 at 4:31 PM, Alex Carver <agcarver+ale at acarver.net>
wrote:

> Others have mentioned persistent information on the system (udev rules,
> previously seen NICs) but there's also just the basic order of bus
> enumeration.  Slot 2 might actually be scanned before Slot 1 (bus order
> is determined by the physical wiring on the board and how they are wired
> to the bus controller).  If Slot 2 comes up first then the kernel sees
> whatever is there first and assigns eth0 as the first available device.
> Then it scans Slot 1 and assigns the next available eth1.
>
> On 2017-02-08 11:05, Brian Stanaland wrote:
> > Hello,
> >
> > This one has bugged me for a while.
> >
> > I understand that the numbering of network interfaces can change when
> adding a
> > network card. What I can't figure out is why it's inconsistent. I have
> two
> > identical servers, same mobo, same NICs in slot 1, same firmware, etc. I
> add a
> > NIC in slot 2 on both severs and reboot. Why does one show the new NIC
> as eth0
> > and the other shows the new NIC as eth1?
> >
> > Google only turns up how to set persistence.
> >
> > --Brian
> >
> >
> > --
> > "Anyone who has never made a mistake has never tried anything new."
> -Albert Einstein
> >
> >
> >
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>
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-- 
"Anyone who has never made a mistake has never tried anything new." -Albert
Einstein
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