They aren't compatible with some Linksys cards, but I believe the preferred replacement card is 3Com.
http://www.elitetrader.com/vb/showthread.php?s=&postid=58399&highlight=linksys+and+IB#post58399
http://www.elitetrader.com/vb/showthread.php?s=&postid=58399&highlight=linksys+and+IB#post58399