From: Ben Greear <greearb@candelatech.com>
To: Albert Lo <alo@airpatrolcorp.com>
Cc: "linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: problems setting the channel
Date: Fri, 13 Sep 2013 10:21:53 -0700 [thread overview]
Message-ID: <523349B1.8010306@candelatech.com> (raw)
In-Reply-To: <bd4dc3b2edbb45789121bddb33960aa2@CO1PR05MB345.namprd05.prod.outlook.com>
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@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
next prev parent reply other threads:[~2013-09-13 17:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-13 17:11 problems setting the channel Albert Lo
2013-09-13 17:21 ` Ben Greear [this message]
2013-09-13 17:30 ` Albert Lo
2013-09-13 17:22 ` Larry Finger
2013-09-13 17:29 ` Albert Lo
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