[B.A.T.M.A.N.] About making batman-adv mesh network invisible

Xuebing Wang xbing6 at gmail.com
Sat Apr 6 08:06:55 CEST 2019


Hi Simon,

Thanks a lot for your reply.

With ath9k chip and ath9k driver, do you think it is possible to use 
"proprietary modulation" (slightly modified), so wireshark + wlan in 
monitor mode won't be able to detect wireless frames batman-adv network 
sends?

Xuebing Wang

On 2019/4/1 下午5:59, Simon Wunderlich wrote:
> Hi Xuebing,
>
> at least for Ad-Hoc mode, you can't hide the SSID without changing the kernel
> driver (mac80211). Encrypting the beacon doesn't help here, as the SSID needs
> to be clear text eventually even if management frames get encrypted.
>
> Cheers,
>         Simon
>
> On Saturday, March 30, 2019 11:50:27 AM CEST Xuebing Wang wrote:
>> Hi community,
>>
>> We have batman-adv + OpenWRT + ath9k chip + ath9k driver reliably
>> running for about 2 years. The biggest batman-adv mesh network is with
>> 100+ nodes.
>>
>> As this is a closed network, we have a new requirement which is to make
>> our batman-adv mesh network invisible, although the current SSID is just
>> some meaningless characters.
>>
>> One thought is hidden_ssid. But, it seems hidden_ssid is only supported
>> for AP mode (not IBSS mode).
>>
>> 802.11w does not protect Beacon frame (because it is before four-ways
>> handshake).
>>
>> As this is a closed network, what about encrypting Beacon (maybe all
>> management frames later) using a hard-coded key in wpa_supplicant?
>>
>> Thanks for your help.
>>
>> Xuebing Wang


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