W dniu 25 kwietnia 2012 20:54 użytkownik Christian Lamparter <chunkeey@xxxxxxxxxxxxxx> napisał: > On Wednesday, April 25, 2012 08:24:23 PM Janusz Dziedzic wrote: >> W dniu 25 kwietnia 2012 19:28 użytkownik Christian Lamparter >> <chunkeey@xxxxxxxxxxxxxx> napisał: >> > On Wednesday, April 25, 2012 07:28:18 AM Janusz Dziedzic wrote: >> > You see without the BIT set, the hardware won't sent any ACKs >> > (Not even those which are directed at this interface - which of >> > course is also bad, or even worse?) and with the BIT set (and if >> > the HW is in Sniffer Mode) then the hardware acks every frames, >> > even if they are for a different stations. >> > So your fix might break someone else's setup. >> > >> >> As I understand, some time ago we had wpa_supplicant AP (GO) mode >> as a two interfaces: AP + MONITOR. >> But now MONITOR is not used. >> Do you know other setup? > I think you are refering to the "cooked" monitor interface, which is > just a monitor interface that gives you frames that mac80211 has > not used internally [mac80211: Add cooked monitor mode support]. > > In fact, most monitors are purly virtual interfaces, unless the > device only has one interface and it is set into monitor mode. > [So, if you don't want to deal with the RX_CTRL_ACK_IN_SNIFFER > bit all you need to do is: add a monitor interface (rather than > set the current interface into this mode) on your STA2 "client" > <http://linuxwireless.org/en/users/Documentation/iw#Adding_interfaces_with_iw> > > Note: This is actually the prefered, because you can use the "normal" > station interface to connect to the web and listen to the air with > the virtual monitor interface on the same device at the same time!] > >> So, maybe firmware should ACK frames with correct destination address >> only (if AR9170_MAC_RX_CTRL_ACK_IN_SNIFFER)? >> Or that is not possible because of HW limitation? > The ACK mechanism (as well as most of the MAC) is done by the hardware > because of the critical timing [and lack of free space]. > So, what steps you suggest? I would like to record traffic from channel 6 and would like to not have this SNIFFER ACK. This is what I tried: - ifconfig wlan0 up (no matter if up or down) - iw phy phy0 interface add moni0 type monitor - iw phy phy0 set channel 6 - ifconfig moni0 up After last step I still see TP drop between AP and STA1 on channel6 BR Janusz -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
