From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: From: Xuebing Wang Subject: [wpa_supplicant] Is there a way to limit peers (to about 12) for IBSS/adhoc? Message-ID: Date: Sat, 3 Jun 2017 12:09:15 +0800 MIME-Version: 1.0 Content-Language: en-US List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "ath10k" Errors-To: ath10k-bounces+kvalo=adurom.com@lists.infradead.org To: hostap@lists.infradead.org Cc: Jason Toschlog , b.a.t.m.a.n@lists.open-mesh.org, Sven Eckelmann , "ath10k@lists.infradead.org" , simon Wunderlich Hi community, This email is mainly addressed to hostap/wpa_supplicant mailing list. Descriptions of my issue: - I am establishing IBSS/adhoc network using OpenWRT 15.05 + ath9k (AR9331). - When nodes are relatively closely placed, the peers (the term is 'neighbors' in batman-adv mesh) reach 40, ath9k driver detects "tx hung, resetting the chip" (for RESET_TYPE_TX_HANG). - This ath9k "tx hung" randomly happens among the 40 nodes (in adhoc network), and it happens relatively often (seemingly randomly for nodes), and randomly makes some nodes un-usable. - This appears to be an issue with ath9k kernel driver or ath9k hardware that it can not handle ~40 peers. - IBSS/adhoc with 20 peers work well. Is there a config in wpa_supplicant that we can limit the number of peers? In the other words, once the number of peers ('iw wlan0 station dump') reaches a pre-configured number (e.g. 12 or 16), wpa_supplicant does not authenticate any more, for IBSS/adhoc only? - A subtle detail: once a new beacon with higher RSSI is detected, the current connection with lowest RSSI will be de-authenticated, and to authenticate this new peer (with higher RSSI in beacon). Is this "limiting number of peers for IBSS/adhoc" a good work-around for 40+ peers adhoc network, although the ultimate root cause seemingly is with ath9k kernel driver or ath9k hardware? Also, if there are many (like 40+) peers in IBSS/adhoc network, I am not sure how medium access contention and collisions factor in, for management frames? Here is my wpa_supplicant conf file: ------ ctrl_interface=/var/run/wpa_supplicant # use 'ap_scan=2' on all devices connected to the network # this is unnecessary if you only want the network to be created when no other networks are available ap_scan=2 network={ ssid="Net-xxxxxxxx" mode=1 frequency=2462 proto=WPA2 key_mgmt=WPA-PSK pairwise=CCMP group=CCMP psk="xxxxxxxx" } ------ Another approach could be to use user-space shell script to "iw ibss leave" for the lower RSSI stations? - As I am using batman-adv to build mesh network on the top of IBSS/adhoc, a similar approach can be done at batman-adv level. Suggestions? Thanks. Xuebing Wang _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k