[B.A.T.M.A.N.] help for batman-adv with monitor WiFi card

[B.A.T.M.A.N.] help for batman-adv with monitor WiFi card

[jammy]

Hi all，

Now i have build a mesh network with batman-adv routing algorithm（batman-adv-2014.2.0）and Linux 3.3.8. Each mesh node have one WiFi card which is configued to the adhoc mode （according to the suggestion of openmesh website）and 11A protocol.

But the data rate between two mesh nodes is only 8Mbps，while if I configure the same WiFi card in mesh node to AP mode and client mode，the datarate between them can achive 40Mbps.

I think the reason of the low data rate is caused by the adhoc mode（my wireless driver is ath9k，the datarate of adhoc mode is slower indeed）

My questions are：
1. How can I raise the data rate to 30M+ if I use the adhoc mode？
2. can I use the monitor mode of WiFi card with batman-adv？someone tells that it can be done，but when I batctl addif wlan0 （wlan0 is configured in monitor），it shows that interface type not support by batman-adv.

I am waiting for your replies and thank you very much.

from jammy's iPhone

Re: [B.A.T.M.A.N.] help for batman-adv with monitor WiFi card

[Antonio Quartulli]

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Hi jammy,

On 09/10/14 05:26, jammy wrote:
> 
> Hi all，
> 
> Now i have build a mesh network with batman-adv routing algorithm（batman-adv-2014.2.0）and Linux 3.3.8. Each mesh node have one WiFi card which is configued to the adhoc mode （according to the suggestion of openmesh website）and 11A protocol.
> 
> But the data rate between two mesh nodes is only 8Mbps，while if I configure the same WiFi card in mesh node to AP mode and client mode，the datarate between them can achive 40Mbps.
> 
> I think the reason of the low data rate is caused by the adhoc mode（my wireless driver is ath9k，the datarate of adhoc mode is slower indeed）
> 
> My questions are：
> 1. How can I raise the data rate to 30M+ if I use the adhoc mode？

As far as I know ath9k works usually well in adhoc mode and can reach
much higher datarates. In any case the problem is likely to be ath9k
specific, so batman-adv can't do much for that.

> 2. can I use the monitor mode of WiFi card with batman-adv？someone tells that it can be done，but when I batctl addif wlan0 （wlan0 is configured in monitor），it shows that interface type not support by batman-adv.
> 

you cannot add a monitor interface to batman-adv (as explained by the
message), but you should be able to create to interfaces: an adhoc one
to use with batman-adv and a monitor one to use for your purposes.

This is what most people do.


Cheers,

-- 
Antonio Quartulli


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Re: [B.A.T.M.A.N.] help for batman-adv with monitor WiFi card

[Dirk van der Walt]

Hi Jammy,

I can also confirm what Antonio replied.

When I was building firmware for MESHdesk using the then trunk
(Barrier Breaker) I nearly gave up on the Dragino hardware (AR9331)
because the adhoc connections between nodes refused to connect beyond
1Mbps unless you restart the WiFi a one or more times.

Other Atheros based hardware like the OM2P's did not have the same issue though.

On advise from Steve Song (Village Telco) I tried Attitude Adjustment
and all that problems disappeared and there is now proper speed
between the adhoc connections.

I haven't tried again on Barrier Breaker, but will probably in the
near future do another attempt and see if the problem still exists now
that it has been released.

Cheers