Re: [B.A.T.M.A.N.] batman-adv: ap mode with isolation enabled

[NicoEchániz <nicoechaniz@altermundi.net>]

On 10/12/12 01:29, Marek Lindner wrote:
> On 10/12/2012 12:13 PM, Nicolás Echániz wrote:
>> Here's a blog post on this matter with related graphics:
>> http://blog.altermundi.net/article/batman-adv-ap-mode-with-isolation-enabled/
>>
>>
>> Summary:
>> Infrastrucutre nodes tend to "confuse" batman-adv. Every client
>> connected to an ap will “think” that it is directly connected to every
>> other client, which creates a mess in potential hops selection.
> 
> Guess you have to better explain your setup if you want others to
> understand. The phrase "the networks uses mixed adhoc and infrastructure
> modes" is not self-explanatory.

will do:

Our nodes are mostly TP-Link MR3220 or WR842N with a second wifi
interface connected by USB (usually WN722N).

These usb dongles use ath9k_htc which is stable and performant in
infrastructure mode, but not so in adhoc. So until our dear ordex :) can
get the time to squash whatever bugs are preventing the dongles from
performing well in adhoc, the networks are using both adhoc and
infrastructure. As a result, some links are adhoc and others are not.


The infrastructure links are the ones that show the behaviour described:
all clients of an AP believe they are neighbors, and isolation so far
seems to prevent this effectively.

The network in question covers 70% of a sparsely populated town and
currently has 15 active nodes with links ranging from 0.1 to 3Km, plus a
16Km link to a neighboring city.


The images in the link provided help ilustrate the differences observed
with and without isolation.


Is the setup clear enough now? or am I missing the point as to what is
unclear? Please ask whatever needs to be clarified.


cheers,
Nico.