Fw: Udev naming conventions.

Fw: Udev naming conventions.

[Scott Farwell]

I want to control what Ethernet interfaces are named eth0, eth1, eth2, eth3, 
etc....based on MAC address but I don't want them named anything other than 
eth0 - ethx so that it remains backwards compatible with software written to 
check eth0.

So I'm not wanting to rename anything, I just want to bind each ethx device 
name to a specific hardware port based on MAC address.  That way if I 
physically lost eth1 for some reason (burned up chip) I wouldn't end up with 
my 3rd Ethernet port(eth2) renamed to eth1 on the next bootup.

I was told that udev is the way to enable device persistence, but it appears 
that it requires me to rename my interfaces something other than eth0 - 
ethx. 



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Re: Fw: Udev naming conventions.

[Bryan Kadzban]

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Scott Farwell wrote:
> So I'm not wanting to rename anything, I just want to bind each ethx 
> device name to a specific hardware port based on MAC address.
> 
> I was told that udev is the way to enable device persistence, but it 
> appears that it requires me to rename my interfaces something other 
> than eth0 - ethx.

Not anymore.  :-)  It used to require non-ethX names, because trying to
rename eth2 to eth1 while trying to rename eth1 to eth2 would fail
(because both target devices existed).  But a delay loop and temporary
target names were added to udevd when renaming NICs, so that renames
like that should eventually complete.  (Assuming a rule exists for both
NICs, of course.)

You need udev-095 or later (earlier versions didn't have the rename loop
code), but that shouldn't be too bad.
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