Comment 6 for bug 994227

I use madwimax to connect that modem, I do not use ifup/ifdown at all. Both ifup and ifdown respond smth like «ignoring unknown device wimax0». When I'm done with my wimax network, I just unplug the modem from the usb port without manual invocation of any command.

There is no dhclient for wimax in the process list.
However there are lots of dhclients for wlan0, I'm surprised:

# ps aux|grep dhcl
root 461 0.0 0.0 7256 672 ? Ss May03 0:00 /sbin/dhclient -v wlan0
root 1037 0.0 0.0 7256 1076 ? Ss 00:25 0:00 dhclient wlan0
root 1917 0.0 0.0 7256 1080 ? Ss 00:26 0:00 dhclient wlan0
root 2896 0.0 0.0 7256 1080 ? Ss 00:28 0:00 dhclient wlan0
root 3125 0.0 0.0 7256 612 ? Ss 09:14 0:00 /sbin/dhclient -v wlan0
root 5662 0.0 0.0 7256 1076 ? Ss 00:31 0:00 /sbin/dhclient -v wlan0
root 5844 0.0 0.0 7256 1076 ? Ss 00:31 0:00 dhclient wlan0
root 6000 0.0 0.0 7256 1076 ? Ss 00:31 0:00 dhclient wlan0
root 8735 0.0 0.0 7256 672 ? Ss Apr29 0:02 /sbin/dhclient -v wlan0
root 9921 0.0 0.0 7256 672 ? Ss Apr29 0:02 /sbin/dhclient -v wlan0
root 10393 0.0 0.0 7256 660 ? Ss Apr29 0:02 /sbin/dhclient -v wlan0
root 12605 0.0 0.0 9344 928 pts/8 S+ 11:02 0:00 grep --color=auto dhcl
root 13280 0.0 0.0 7256 616 ? Ss 09:26 0:00 dhclient wlan0
root 14263 0.0 0.0 7256 1076 ? Ss 00:43 0:00 dhclient wlan0
root 17101 0.0 0.0 7256 1076 ? Ss May03 0:00 /sbin/dhclient -v wlan0
root 17651 0.0 0.0 7256 1080 ? Ss May03 0:00 dhclient wlan0
root 23960 0.0 0.0 7256 1080 ? Ss 00:13 0:00 /sbin/dhclient -v wlan0
root 24726 0.0 0.0 7256 1072 ? Ss 00:58 0:00 /sbin/dhclient -v wlan0
root 25175 0.0 0.0 7256 1080 ? Ss 00:58 0:00 dhclient wlan0
root 26028 0.0 0.0 7256 1080 ? Ss 00:15 0:00 dhclient wlan0
root 27123 0.0 0.0 7256 276 ? Ss Apr30 0:02 /sbin/dhclient -v wlan0
root 30309 0.0 0.0 7256 1072 ? Ss 07:37 0:00 /sbin/dhclient -v wlan0
root 32204 0.0 0.0 7256 1080 ? Ss 00:24 0:00 dhclient wlan0

And again now wlan0.dhclient has disappeared, while wimax0.dhclient is present…