Until recently I could do this: echo -n moni0 > /sys/class/ieee80211/phy*/add_iface iwconfig moni0 mode monitor ip link set moni0 up tcpdump -i moni0 -l -n It doesn't work in Fedora 8 though -- what replaces it?
Those bits were removed upstream in order to reduce the sysfs user interface commitment. It may or may not come back there. The netlink-based tool that give this functionality is here: http://git.sipsolutions.net/iw.git/ We probably need to get that packaged for F9. But for now it doesn't do much...except add and remove interfaces... :-) In the meantime, I'll add a patch to restore the sysfs bits in F8. Please test 2.6.23.8-63.fc8 when it is available. Does that work for you?