Hi Ben, yes, for normal use, I shouldn't have to specify the channel. But I have a not normal use case. Thx. cheers, Albert ________________________________________ From: Ben Greear <greearb@xxxxxxxxxxxxxxx> Sent: Friday, September 13, 2013 10:21 AM To: Albert Lo Cc: linux-wireless@xxxxxxxxxxxxxxx Subject: Re: problems setting the channel On 09/13/2013 10:11 AM, Albert Lo wrote: > > Hello, > > Forgive the newbie question, but I'm having a hard time setting the channel. Here is my output: > > ====================================== > root@OpenWrt:~# iw dev wlan0 info > Interface wlan0 > ifindex 7 > wdev 0x2 > addr 04:f0:21:01:1b:91 > type AP > wiphy 0 > channel 11 (2462 MHz) NO HT > root@OpenWrt:~# iw reg get > country US: > (2402 - 2472 @ 40), (3, 27) > (5170 - 5250 @ 40), (3, 17) > (5250 - 5330 @ 40), (3, 20), DFS > (5490 - 5600 @ 40), (3, 20), DFS > (5650 - 5710 @ 40), (3, 20), DFS > (5735 - 5835 @ 40), (3, 30) > root@OpenWrt:/# iw dev wlan0 set channel 10 > root@OpenWrt:/# iw dev wlan0 set channel 19 > command failed: Invalid argument (-22) > ================================================== > > > Any ideas why setting channel to 10 is ok, but setting channel to 19 fails? > I do notice that my phy is split into two parts, Band1 and Band2. There is no channel 19. Band2 starts at channel 36. > Frequencies: > * 5180 MHz [36] (17.0 dBm) > * 5200 MHz [40] (17.0 dBm) > * 5220 MHz [44] (17.0 dBm) > * 5240 MHz [48] (17.0 dBm) > * 5260 MHz [52] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5280 MHz [56] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5300 MHz [60] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5320 MHz [64] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5500 MHz [100] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5520 MHz [104] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5540 MHz [108] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5560 MHz [112] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5580 MHz [116] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5600 MHz [120] (disabled) > * 5620 MHz [124] (disabled) > * 5640 MHz [128] (disabled) > * 5660 MHz [132] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5680 MHz [136] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5700 MHz [140] (20.0 dBm) (passive scanning, no IBSS, radar detection) > * 5745 MHz [149] (30.0 dBm) > * 5765 MHz [153] (30.0 dBm) > * 5785 MHz [157] (30.0 dBm) > * 5805 MHz [161] (30.0 dBm) > * 5825 MHz [165] (30.0 dBm) For normal use, you usually don't need to specify the channel anyway, by the way. Thanks, Ben -- Ben Greear <greearb@xxxxxxxxxxxxxxx> Candela Technologies Inc http://www.candelatech.com -- 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
