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.
==================================================
root@OpenWrt:~# iw phy phy0 info
Wiphy phy0
Band 1:
Capabilities: 0x11ce
HT20/HT40
SM Power Save disabled
RX HT40 SGI
TX STBC
RX STBC 1-stream
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 8 usec (0x06)
HT TX/RX MCS rate indexes supported: 0-15
Frequencies:
* 2412 MHz [1] (27.0 dBm)
* 2417 MHz [2] (27.0 dBm)
* 2422 MHz [3] (27.0 dBm)
* 2427 MHz [4] (27.0 dBm)
* 2432 MHz [5] (27.0 dBm)
* 2437 MHz [6] (27.0 dBm)
* 2442 MHz [7] (27.0 dBm)
* 2447 MHz [8] (27.0 dBm)
* 2452 MHz [9] (27.0 dBm)
* 2457 MHz [10] (27.0 dBm)
* 2462 MHz [11] (27.0 dBm)
* 2467 MHz [12] (disabled)
* 2472 MHz [13] (disabled)
* 2484 MHz [14] (disabled)
Bitrates (non-HT):
* 1.0 Mbps
* 2.0 Mbps (short preamble supported)
* 5.5 Mbps (short preamble supported)
* 11.0 Mbps (short preamble supported)
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Band 2:
Capabilities: 0x11ce
HT20/HT40
SM Power Save disabled
RX HT40 SGI
TX STBC
RX STBC 1-stream
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 8 usec (0x06)
HT TX/RX MCS rate indexes supported: 0-15
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)
Bitrates (non-HT):
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
.......
Any ideas as to how I can set wlan0 to the channels in Band2?
Best Regards,
Albert
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 <[email protected]>
Sent: Friday, September 13, 2013 10:21 AM
To: Albert Lo
Cc: [email protected]
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 <[email protected]>
Candela Technologies Inc http://www.candelatech.com
On 09/13/2013 12:11 PM, 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)
--snip--
> Any ideas as to how I can set wlan0 to the channels in Band2?
There is no channel 19 in wifi! That is the reason you cannot select it.
To select Band 2, you would need a dual-band Access Point. Do you have one?
Clearly, you have little knowledge of wifi. I suggest you read
http://en.wikipedia.org/wiki/List_of_WLAN_channels.
Larry
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 <[email protected]>
Candela Technologies Inc http://www.candelatech.com
Hi Larry,
Thanks for the info. I tried setting the channel to one that is listed in the link you provided, and even to one that is listed in phy info. ch=36 is nice and safe.
however when I type:
> iw dev wlan0 info
It is still reporting it's on the old channel (11).
Any ideas why it is reporting the old channel?
Thx.
Cheers,
Albert
________________________________________
From: Larry Finger <[email protected]> on behalf of Larry Finger <[email protected]>
Sent: Friday, September 13, 2013 10:22 AM
To: Albert Lo
Cc: [email protected]
Subject: Re: problems setting the channel
On 09/13/2013 12:11 PM, 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)
--snip--
> Any ideas as to how I can set wlan0 to the channels in Band2?
There is no channel 19 in wifi! That is the reason you cannot select it.
To select Band 2, you would need a dual-band Access Point. Do you have one?
Clearly, you have little knowledge of wifi. I suggest you read
http://en.wikipedia.org/wiki/List_of_WLAN_channels.
Larry