Ubuntu Breedy Problem with cisco airo wireless

I finally arrange time to upgrade my old laptop to breedy last week. Unfortunately, I found the KDE reponse is fairy slow. I am not sure why.
Another problem is the airo wireless card driver creates two interfaces --- eth1 and eth2, ifconfig returns sth. like:
eth1 Link encap:UNSPEC HWaddr 00-09-E8-B4-CF-8D-6C-6F-00...
BROADCAST MULTICAST MTU:2312 Metric:1
RX packets:2 errors:7 dropped:0 overruns:0 frame:7
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:105 (105.0 b) TX bytes:0 (0.0 b)
Interrupt:3 Base address:0x100

eth2 Link encap:Ethernet HWaddr 00:09:E8:B4:CF:8D
inet addr:192.168.0.101 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::209:e8ff:feb4:cf8d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:3 errors:1014 dropped:0 overruns:0 frame:1014
TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1186 (1.1 KiB) TX bytes:920 (920.0 b)
Interrupt:3 Base address:0x100
With this kind of configuration, the wireless network cannot be brought up by default.
In this post, byronclark told me airo card create one interface to rfmon mode to monitor sth. To overcome the problem, I changed /etc/iftab to bind the MAC address of my card to eth1, as:
eth1 mac 00:09:e8:b4:cf:8d arp 1
Now, it is OK.