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

Simon Wunderlich sw at simonwunderlich.de
Mon Apr 8 10:10:27 CEST 2019


Hi Xuebing,

I'm not aware of any "proprietary modulation", and I doubt it's possible - at 
least not while using an AP at the same time. You can look into 5/10 MHz mode 
or do other quirks if mesh is the only thing running on your module though.

Cheers,
     Simon

On Saturday, April 6, 2019 2:06:55 PM CEST Xuebing Wang wrote:
> 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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