Replacement motherboard, renumbered NICs and dvd drives?

[Adam Funk]

The computer store has replaced my faulty motherboard twice recently,
and each time the number of the on-board LAN (the only ethernet device
present) has gone up (eth0 -> eth1, and now eth2).  Does anyone know
why, and is it possible to reset it?


I've also had changes in my /dev/cd* and /dev/dvd* too; a distro
upgrade (possibly the last one, from Feisty to Gutsy) changed
/dev/cdrw to /dev/cdrw1 (and /dev/dvd and /dev/cdrom similarly); I now
have the following:

   $ ls -l /dev/cdr* /dev/dvd*
   lrwxrwxrwx 1 root root 3 2008-02-25 10:17 /dev/cdrom2 -> hdb
   lrwxrwxrwx 1 root root 3 2008-02-25 10:17 /dev/cdrom3 -> hda
   lrwxrwxrwx 1 root root 3 2008-02-25 10:17 /dev/cdrw3 -> hda
   lrwxrwxrwx 1 root root 3 2008-02-25 10:17 /dev/dvd2 -> hdb
   lrwxrwxrwx 1 root root 3 2008-02-25 10:17 /dev/dvd3 -> hda
   lrwxrwxrwx 1 root root 3 2008-02-25 10:17 /dev/dvdrw3 -> hda

Can I somehow reset those back to the "unnumbered" versions too?

Thanks,
Adam