Wireless - Dapper

[John Dangler]

I have a Dell 8600 Inspiron w/IPW2100 wireless connected to eth1.
I have had no problems in connecting to wireless networks in other parts
of the country while traveling.  I recently added a Linksys 4400N
wireless router in my home office, and I have a win box that connects to
it using a WUSB54G adapter.  However, the Ubuntu laptop will not connect
to it.  iwconfig shows the ESSID and lsmod | grep ipw2100 shows the
drivers as loaded (both as ipw2100 and ieee80211).
I've tried going through the network manager (System->Admin->Networks),
and setting different locations with different setups, but it doesn't
seem to help.  Setting the wireless to either DHCP or Static IP doesn't
resolve it.

I think the problem is in the /etc/network/interfaces file.
Can I create a network/interfaces to load as a default, and an alternate
interfaces file to load when I want to use eth1 for wireless?

I installed airsnort to see if I could see the network, but airsnort
just gives me the following errors:
ymsmoke at Nebo:~$ sudo airsnort
/sbin/wlanctl-ng eth1 lnxreq_ifstate ifstate=enable > /dev/null
wlanctl-ng: Operation not supported
/sbin/wlanctl-ng eth1 lnxreq_wlansniff enable=true channel=3
keepwepflags=false prismheader=false > /dev/null
wlanctl-ng: Operation not supported
/sbin/wlanctl-ng eth1 lnxreq_wlansniff enable=true channel=4
keepwepflags=false prismheader=false > /dev/null
wlanctl-ng: Operation not supported
/sbin/wlanctl-ng eth1 lnxreq_wlansniff enable=true channel=5
keepwepflags=false prismheader=false > /dev/null
wlanctl-ng: Operation not supported

Any input is appreciated.

tia