pozri na toto:
http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man8/ifconfig.8.html
Bonding pomocou ifconfig. Je problem ze musi suportovat druha strana IEEE 802.3ad Link Aggregation.
Myslim ze s wifi ti to nepojde ale mozes skusit.
Tu je how-to na wifi pomocou ubuntu:
http://blog.buttermountain.co.uk/2007/09/14/redundant-bonding-of-wireless-and-wired-interfaces-in-ubuntu/
Malo by byt podobne.