[Babel-users] Diversity routing in a many channeled world

[Dave Taht]

On Wed, Jun 17, 2015 at 4:20 PM, Dave Taht <dave.taht at gmail.com> wrote:
> On Wed, Jun 17, 2015 at 3:38 PM, Juliusz Chroboczek
> <jch at pps.univ-paris-diderot.fr> wrote:
>>> To somewhat answer my own question, when babel is used on a standalone
>>> "AP" interface, it is unable to automagically determine the channel it is
>>> on. So I guess whatever it uses can only figure out a adhoc interface?
>>
>>
>> The message you're getting means that the SICGIWFREQ ioctl has failed.
>> Could you please ask the netdev mailing list whether it's supposed to
>> succeed on an AP, and whether I should be using a different API?
>
> well, linux-wireless would be better and for sanity's sake I am
> currently on neither list.
>
> So I went to a definitive bit of source code instead:
>
> apt-get source network-manager
>
> This has a truly mindblowing level number of abstractions piled on
> abstractions...
>
> and what I see in src/wifi are libs for wext and nl80211.
>
> for wext, I see SIOCSIWFREQ being used, only, in network-manager.  I
> have no idea what the two differ in actual intent?

No. I was incorrect here. CGIWFREQ is used in wext in network-manager.

union iwreq_data on the other hand in /usr/include/linux/wireless.h
is quite a bit larger than iw_freq in the babel code. I guess stracing
is in order. And testing to see if it works in adhoc presently at all.

> #define SIOCSIWFREQ     0x8B04          /* set channel/frequency (Hz) */
> #define SIOCGIWFREQ     0x8B05          /* get channel/frequency (Hz) */
>
> nl80211 has this rather big dump format, but seems comprehensive.
>
> I would suspect nl80211 is more of what is needed nowadays... (this is
> an ath9k chip here)... or all 3.
>
> sort of on this topic was being able to distinguish between ht20,
> ht40, and the newer vht80, 160, 320 modes, which babel supports
> multiple channels in the encoding, but I am not sure is pulled out in
> the code. And on 2.4ghz channel 3 interferes with both 1 and 6. Etc.
>
> on to babel-1.6.2! :)
>
>
>
>> -- Juliusz
>
>
>
> --
> Dave Täht
> worldwide bufferbloat report:
> http://www.dslreports.com/speedtest/results/bufferbloat
> And:
> What will it take to vastly improve wifi for everyone?
> https://plus.google.com/u/0/explore/makewififast



-- 
Dave Täht
worldwide bufferbloat report:
http://www.dslreports.com/speedtest/results/bufferbloat
And:
What will it take to vastly improve wifi for everyone?
https://plus.google.com/u/0/explore/makewififast