Hi Ralph, hm; depends, I think.
So, there's two things: If you're referring to a channel switch announcement, that can be part of a management frame [1]. But I think it can also be part of a beacon frame. Or a probe response frame. Luckily, 802.11 is not confusing the least. Blind guess is that you should look into airprobe-ng's "aireplay" program and see whether it can synthesize such a frame. Basically, you should be able to forge at least beacon frames, which might be helpful as soon as you deauthenticated a station; a very common attack. More likely, even, is that you're talking about mimicking a fake radar. I guess the appropriate way to do that is probably sending something that looks sufficiently close enough to a chirp to the OFDM demod, I think. I'm too lazy to read this myself :D, so go and read 5.3.8.1 and following of ETSI EN 301 893 [2], and refer to a trustworthy free and open WiFi card driver (hint hint: atheros 9k, dfs_pattern_detector.c). Best regards, Marcus [1] https://mentor.ieee.org/802.11/dcn/10/11-10-0097-06-00ae-management-frame-analysis.xls [2] https://www.etsi.org/deliver/etsi_en/301800_301899/301893/01.05.01_60/en_301893v010501p.pdf On 08.01.2016 21:47, Ralph A. Schmid, dk5ras wrote: > Hi, > > Does anybody know how a signal must look to trigger a 5 GHz WLAN for a > frequency change? I intend testing this feature by transmitting a radar-like > signal with gnuradio, but for this I should know how this detection works, > how such a signal does look :) > > Ralph. > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
