Sending lldp packets with ath10k in ADHOC mode

Sending lldp packets with ath10k in ADHOC mode

[Jorge Baranda]

Dear all,

I have a setup which consists of three computers connected by means of 
WLE900VX cards using the ath10k driver.
One computer (which we can call master) is equipped with two of these 
cards and I set different modes to connect the "master" with the other 
computers.
In particular, a pair of computers (master-computer A) is connected in 
ad-hoc mode and the other pair (master-computer B) is connected in 
AP-STA mode.

I want to send LLDP packets through both interfaces of master computer 
to perform link discovery. But I have realised that sending LLDP 
messages is only possible through the
interface configured as AP. Nevertheless, I've seen that the ad-hoc 
interface is able to send ARP broadcast messages.
Due to this fact, when generating the LLDP packets I set as destination 
MAC address the broadcast one, but even so, the ad-hoc interface is not 
sending the LLDP messages.
Does anyone have an idea of the reason of this behavior? Which is 
treating differently the ARP and the LLDP packet?
I was expecting the ad-hoc interface to forward any kind of packet with 
mac destination address the broadcast address.

Thank you very much in advance for your time and attention,

With kind regards,

-- 
Jorge Baranda
Research Engineer, MSc
jorge.baranda@cttc.es

Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Av. Carl Friedrich Gauss, 7
08860 Castelldefels, Barcelona (Spain)
Tel: +34 93 645 29 00  Ext: 2171
Fax. +34 93 645 29 01
www.cttc.es


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Re: Sending lldp packets with ath10k in ADHOC mode

[Jorge Baranda]

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Dear all,

I upload a wireshark capture to illustrate the behavior previously 
described. This wireshark is showing the traffic in the "master" computer.
It is suppossed that both interfaces should be sending periodicall LLDP 
packets (with broadcast mac dst addr), but only the one configured in AP 
mode is sending such packets.
However, when I try to look for a host through the interface configure 
in ad-hoc, the ARP process starts with the broadcast ARP request and 
this message is sent (and registered bywireshark) through the interface 
configure in  ad-hoc. Does the ath10k driver has to do something with 
the different treatment of the broadcast packets/protocols?
Aparently, all broadcast packets should be sent by the wireless 
interface no matter its configuration (AP or ad-hoc), isn't it?

Thanks in advance,

Jorge


El 23/09/15 17:12, Jorge Baranda escribió:
> Dear all,
>
> I have a setup which consists of three computers connected by means of 
> WLE900VX cards using the ath10k driver.
> One computer (which we can call master) is equipped with two of these 
> cards and I set different modes to connect the "master" with the other 
> computers.
> In particular, a pair of computers (master-computer A) is connected in 
> ad-hoc mode and the other pair (master-computer B) is connected in 
> AP-STA mode.
>
> I want to send LLDP packets through both interfaces of master computer 
> to perform link discovery. But I have realised that sending LLDP 
> messages is only possible through the
> interface configured as AP. Nevertheless, I've seen that the ad-hoc 
> interface is able to send ARP broadcast messages.
> Due to this fact, when generating the LLDP packets I set as 
> destination MAC address the broadcast one, but even so, the ad-hoc 
> interface is not sending the LLDP messages.
> Does anyone have an idea of the reason of this behavior? Which is 
> treating differently the ARP and the LLDP packet?
> I was expecting the ad-hoc interface to forward any kind of packet 
> with mac destination address the broadcast address.
>
> Thank you very much in advance for your time and attention,
>
> With kind regards,
>


-- 
Jorge Baranda
Research Engineer, MSc
jorge.baranda@cttc.es

Centre Tecnològic de Telecomunicacions de Catalunya (CTTC)
Av. Carl Friedrich Gauss, 7
08860 Castelldefels, Barcelona (Spain)
Tel: +34 93 645 29 00  Ext: 2171
Fax. +34 93 645 29 01
www.cttc.es


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