I have three laptops that I want to connect occasionnally in adhoc mode, all with up to date debian stretch :
laptop A : kernel 4.9.0-5-amd64, KF5 plasma-network-manager, firewall ufw, Intel Wireless 8260 (rev 3a)
laptop B : kernel 4.9.0-5-686, KF5 plasma-network-manager, atheros AR9285, no firewall
laptop C : kernel 4.9.0-5-686, LXDE/Openbox, nm-applet, Intel Wireless 3945, no firewall
wifi work perfectly on all for accessing the internet, even using a mobile phone shared access point.
B (192.168.0.2) and C (192.168.0.3) can connect to each other using adhoc (simple configuration in the respective network manager applets, with WEP128 key for testing purpose), they can ping, ssh and sync files.
Problem:
1- A cannot join the same SSID network as ip 192.168.0.1. A and B have the same plasma-nm applet gui, so there should not be a misconfiguration issue. plasma-network-manager seems to spit out errors in /var/log/daemon.log :
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Feb 14 13:40:06 linux-xxxx wpa_supplicant[6234]: wlan0: Trying to associate with SSID 'MYSSID'
Feb 14 13:40:06 linux-xxxx wpa_supplicant[6234]: wlan0: Association request to the driver failed
Feb 14 13:40:06 linux-xxxx wpa_supplicant[6234]: wlan0: CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="MYSSID" auth_failures=3 duration=30 reason=CONN_FAILED
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iwconfig wlan0 channel auto essid MYSSID mode ad-hoc key s:XXXXXXXXXXXX
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wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.1 netmask 255.255.255.0 broadcast 192.168.0.255
etc.
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iwlist wlan0 scan | grep -B5 -A13 MYSSID
Cell 35 - Address: A2:38:83:C7:C3:C9
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=70/70 Signal level=-26 dBm
Encryption key:on
ESSID:"MYSSID"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Ad-Hoc
Extra:tsf=0000000011bf2941
Extra: Last beacon: 188ms ago
IE: Unknown: 0005414C494B41
IE: Unknown: 010882040B160C121824
IE: Unknown: 030101
IE: Unknown: 06020000
IE: Unknown: 32043048606C
IE: Unknown: 7F0800000A0200000040
IE: Unknown: DD070050F202000100