Specific MAC address impact performance

[Yu-Chieh]

Hi Ben,
i did some experiments today.
1. change the node C to AP mode (using same MAC),  performance of A to B is good
2. keep node C as adhoc mode but chaneg the cell-id and ssid.
performance is deteriorated
I am just wondering if any packet of adhoc mode(beacon? probe request?
probe response) will screw up wifi network?

Thanks,
Jay

2015-10-27 1:47 GMT+08:00 Ben Greear <greearb at candelatech.com>:
> On 10/26/2015 10:38 AM, Yu-Chieh wrote:
>>
>> Hi Ben,
>> I also geuss that mignt be BSSID mask issue, however i have no idea
>> about the patten
>> I can find bssid_mask function in ath5k and ath9k but not in ath10k.
>> Do your suggest me to use XX:XX:XX:YY:YY:XX, XX should be same and YY
>> could be different?
>
>
> Please try something that works properly with the way ath9k does it's
> mask and see if that fixes your problem in ath10k.
>
> Basically, if your NIC has an address:  00 11 22 33 44 55, then change the
> 33 and/or 44
> octets when creating secondary vifs.  This assumes you buy your NICs in
> batches and the
> low octet is likely unique.
>
> As long as you have a unique octet among all of your radios in the local RF
> environment, then you should be fine.
>
> Somewhere there was once a security related document on how to screw up
> wifi networks by setting a mask to purposefully cause troubles....you might
> try to find that and see if it provides some more precise details on
> the masking algorithm.
>
> Thanks,
> Ben
>
>>
>> Thanks.
>>
>> Jay
>>
>> 2015-10-26 23:12 GMT+08:00 Ben Greear <greearb at candelatech.com>:
>>>
>>> Your probably have BSSID mask collision.  Rule of thumb is to leave
>>> all octets the same except the second and third (from the right)
>>> byte.  That usually gives you unique masks assuming the right-most
>>> byte is unique for your radios.
>>>
>>> Thanks,
>>> Ben
>>>
>>>
>>>
>>> On 10/26/2015 03:50 AM, Yu-Chieh wrote:
>>>>
>>>>
>>>> Hi,
>>>>
>>>> I am working on IBSS mode by using ath10k. However i met some problem
>>>> about the performance issue
>>>> First of all, i set up two nodes, A (74:DA:38:19:19:DC) and B
>>>> (74:DA:38:06:E1:96) and run iperf.
>>>> i can get around 170 Mbps form A to B
>>>>
>>>> Then, i turn on the third node C(74:DA:38:06:E1:BE).
>>>> The performance is deteriorated to around 30Mbps.
>>>> If i turn off node C, the performance go back to 170 Mbps.
>>>>
>>>> At the same environment and same devices, i jsut change the mac of B
>>>> to (74:DA:38:06:E1:B2)
>>>> Everything is good.
>>>> No matter node c is on or off, the performance always keep on 170Mbps.
>>>>
>>>> Anyone have any idea about this problem?
>>>>
>>>> Jay
>>>>
>>>> _______________________________________________
>>>> ath10k mailing list
>>>> ath10k at lists.infradead.org
>>>> http://lists.infradead.org/mailman/listinfo/ath10k
>>>>
>>>
>>> --
>>> Ben Greear <greearb at candelatech.com>
>>> Candela Technologies Inc  http://www.candelatech.com
>>
>>
>
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>