iftab_helper does not match driver ipw2100

Binary package hint: udev

My Thinkpad R50 laptop has both Gigabit ethernet using the e1000 driver and WLAN using the ipw2100 driver.

I configured the correct MAC addresses in /etc/iftab:

  eth0 mac ... arp 1
  eth1 mac ... arp 1

Using ethtool -i eth0/eth1 I got this information:

eth0:
  driver: e1000
  version: 7.0.33-k2
  firmware-version: N/A
  bus-info: 0000:02:01.0

eth1:
  driver: ipw2100
  version: 1.1.4
  firmware-version: 712.0.3:3:00000001
  bus-info: 0000:02:02.0

To make the iftab even more specific, I append

  eth0 ... driver e1000
  eth1 ... driver ipw2100

This worked for eth0, but failed for eth1 (WLAN got eth2 now.)

For the moment, I can live with the "MAC only" solution, but I wonder why the WLAN driver was not matched.

Thanks, Jörg