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Date: Thu, 16 Jan 2014 15:38:44 +0000
From: Robert Bradley <robert.bradley1@gmail.com>
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Subject: Re: [Cerowrt-devel] Managed to break 802.11n (on a 3800)
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On 16/01/2014 15:03, Aaron Wood wrote:
> All,
>
> I'm noting this here in case anyone is interested.  After I write this
> up, I'm going to start from scratch on the configuration, and
> factory-reset the router.
>
> =====
>
> The 5GHz radio on my 3800 seems to be in a very odd state.  I'm not
> quire sure what state it's in, but it seems to be only doing HT20 1x1.
>  And in a fairly broken manner at that.
>

<snip>

> And here are radio blocks from the current /etc/config/wireless:
>
> config wifi-device 'radio1'
> option type 'mac80211'
> option macaddr '28:c6:8e:bb:9a:49'
> list ht_capab 'SHORT-GI-40'
> list ht_capab 'TX-STBC'
> list ht_capab 'RX-STBC1'
> list ht_capab 'DSSS_CCK-40'
> option txpower '17'
> option distance '25'
> option channel '48'
> option country 'US'

That's interesting, since it's missing a few configuration options and
seems to be still using the US country code for the 5 GHz interface. 
For what it's worth, my router's configuration looks like this (with the
MAC address changed to match your configuration):

config wifi-device 'radio1'
        option type 'mac80211'
        option channel '36'
        option hwmode '11na'
        option macaddr '28:c6:8e:bb:9a:49'
        list ht_capab 'SHORT-GI-40'
        list ht_capab 'TX-STBC'
        list ht_capab 'RX-STBC1'
        list ht_capab 'DSSS_CCK-40'
        option disabled '0'
        option txpower '17'
        option country 'GB'
        option htmode 'HT40+'

I'm using channel 36 and HT40+ here at 17 dBm.  This is also from a
UK-based router, so you'll probably want to change the country code from
GB to FR.  I'm seeing about 270 Mb/s using Intel wireless (4965AGN) and
Windows 7 about 2.5 m away from the router with those settings.

> config wifi-device 'radio0'
> option type 'mac80211'
> option hwmode '11ng'
> option macaddr '28:c6:8e:bb:9a:47'
> option htmode 'HT20'
> list ht_capab 'SHORT-GI-40'
> list ht_capab 'TX-STBC'
> list ht_capab 'RX-STBC1'
> list ht_capab 'DSSS_CCK-40'
> option txpower '26'
> option country 'FR'
> option distance '15'
> option channel 'auto'
>

My settings for the 2.4 GHz side (deliberately limited to HT20 to avoid
interference):

config wifi-device 'radio0'
        option type 'mac80211'
        option hwmode '11ng'
        option macaddr '28:c6:8e:bb:9a:47'
        option htmode 'HT20'
        list ht_capab 'SHORT-GI-40'
        list ht_capab 'TX-STBC'
        list ht_capab 'RX-STBC1'
        list ht_capab 'DSSS_CCK-40'
        option disabled '0'
        option channel '1'
        option country 'GB'
        option txpower '20'

This time I'm using channel 1 at 20 dBm.  In both of these blocks I'm
leaving the distance option unspecified.

Hope this helps a bit!

-- 
Robert Bradley


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    <div class="moz-cite-prefix">On 16/01/2014 15:03, Aaron Wood wrote:<br>
    </div>
    <blockquote
cite="mid:CALQXh-PCPjr=Fi0pR3zdpaswo47Ozi59d5Zk3+FV1Lpp4Km_8Q@mail.gmail.com"
      type="cite">
      <meta http-equiv="Context-Type" content="text/html;
        charset=ISO-8859-1">
      <div dir="ltr">
        <div>All,</div>
        <div><br>
        </div>
        I'm noting this here in case anyone is interested. &nbsp;After I
        write this up, I'm going to start from scratch on the
        configuration, and factory-reset the router.
        <div>
          <br>
        </div>
        <div>=====</div>
        <div><br>
        </div>
        <div>The 5GHz radio on my 3800 seems to be in a very odd state.
          &nbsp;I'm not quire sure what state it's in, but it seems to be
          only doing HT20 1x1. &nbsp;And in a fairly broken manner at that.</div>
        <br>
      </div>
    </blockquote>
    <br>
    &lt;snip&gt;<br>
    <br>
    <blockquote
cite="mid:CALQXh-PCPjr=Fi0pR3zdpaswo47Ozi59d5Zk3+FV1Lpp4Km_8Q@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>And here are radio blocks from the current
          /etc/config/wireless:</div>
        <div>
          <div><br>
          </div>
          <div>config wifi-device 'radio1'</div>
          <div><span> </span>option type 'mac80211'</div>
          <div><span> </span>option macaddr '28:c6:8e:bb:9a:49'</div>
          <div><span> </span>list ht_capab 'SHORT-GI-40'</div>
          <div><span> </span>list ht_capab 'TX-STBC'</div>
          <div><span> </span>list ht_capab 'RX-STBC1'</div>
          <div><span> </span>list ht_capab 'DSSS_CCK-40'</div>
          <div><span> </span>option txpower '17'</div>
          <div><span> </span>option distance '25'</div>
          <div><span> </span>option channel '48'</div>
          <div><span> </span>option country 'US'</div>
        </div>
      </div>
    </blockquote>
    <br>
    That's interesting, since it's missing a few configuration options
    and seems to be still using the US country code for the 5 GHz
    interface.&nbsp; For what it's worth, my router's configuration looks
    like this (with the MAC address changed to match your
    configuration):<br>
    <br>
    config wifi-device 'radio1'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option type 'mac80211'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option channel '36'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option hwmode '11na'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option macaddr '28:c6:8e:bb:9a:49'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'SHORT-GI-40'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'TX-STBC'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'RX-STBC1'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'DSSS_CCK-40'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option disabled '0'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option txpower '17'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option country 'GB'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option htmode 'HT40+'<br>
    <br>
    I'm using channel 36 and HT40+ here at 17 dBm.&nbsp; This is also from a
    UK-based router, so you'll probably want to change the country code
    from GB to FR.&nbsp; I'm seeing about 270 Mb/s using Intel wireless
    (4965AGN) and Windows 7 about 2.5 m away from the router with those
    settings.<br>
    <br>
    <blockquote
cite="mid:CALQXh-PCPjr=Fi0pR3zdpaswo47Ozi59d5Zk3+FV1Lpp4Km_8Q@mail.gmail.com"
      type="cite">
      <div dir="ltr">
        <div>
          <div>config wifi-device 'radio0'</div>
          <div><span> </span>option type 'mac80211'</div>
          <div><span> </span>option hwmode '11ng'</div>
          <div><span> </span>option macaddr '28:c6:8e:bb:9a:47'</div>
          <div><span> </span>option htmode 'HT20'</div>
          <div><span> </span>list ht_capab 'SHORT-GI-40'</div>
          <div><span> </span>list ht_capab 'TX-STBC'</div>
          <div><span> </span>list ht_capab 'RX-STBC1'</div>
          <div><span> </span>list ht_capab 'DSSS_CCK-40'</div>
          <div><span> </span>option txpower '26'</div>
          <div><span> </span>option country 'FR'</div>
          <div><span> </span>option distance '15'</div>
          <div><span> </span>option channel 'auto'</div>
        </div>
        <br>
      </div>
    </blockquote>
    <br>
    My settings for the 2.4 GHz side (deliberately limited to HT20 to
    avoid interference):<br>
    <br>
    config wifi-device 'radio0'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option type 'mac80211'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option hwmode '11ng'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option macaddr '28:c6:8e:bb:9a:47'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option htmode 'HT20'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'SHORT-GI-40'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'TX-STBC'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'RX-STBC1'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; list ht_capab 'DSSS_CCK-40'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option disabled '0'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option channel '1'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option country 'GB'<br>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; option txpower '20'<br>
    <br>
    This time I'm using channel 1 at 20 dBm.&nbsp; In both of these blocks
    I'm leaving the distance option unspecified.<br>
    <br>
    Hope this helps a bit!<br>
    <pre class="moz-signature" cols="72">-- 
Robert Bradley</pre>
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