--- On Tue, 11/12/12, Balasubramaniam Natarajan <[email protected]> wrote:

> > > This worked on an instance, thanks.  However
> how do I make sure that the
> > OS
> > > does not rename the interface automatically and
> cause this confusion ?
> > >
> >
> > See above - entries in the persistent rules file should
> not change
> > mapping of eth name to mac address.  You can make
> a backup copy of the
> > persistent rules file for reference.
> >
> >
> >
> This has happened around 3 time in approximately 50 servers
> so far.  If the
> same continues I am planning to turn on the file immutable
> with chattr to
> prevent it from getting changed, do you think that might
> help ?
> 

Sometime back I faced the similar  situation. I wanted all eth's to be static 
even if card is changed (a box in a remote location).
I edited /etc/udev/rules.d/75-persistent-net-generator.rules. In whitelist I 
added eth*. This stopped udev from assigning rules for eth.

However, what you face should be bug. Better to take it in debian mailing list.
Raman.P
blog:http://ramanchennai.wordpress.com/

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