Why ad-hoc network devices do not see each other?

I have 3 devices. On one tetwork one device can see another, yet they both can not see the third one. They are in same wi-fi ad-hoc network. 2 of them see each other and one does not see no one. Devices are in cl.ose proximity (10cm). How to figure out why? For one That does not play with others: ==== Here is ifconfig: root@edison:~# ifconfig wlan0 wlan0 Link encap:Ethernet HWaddr 78:4b:87:a9:87:53 inet addr:192.168.2.50 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::7a4b:87ff:fea9:8753/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1528 Metric:1 RX packets:1342297 errors:0 dropped:852312 overruns:0 frame:0 TX packets:158162 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:80024954 (76.3 MiB) TX bytes:10973582 (10.4 MiB) Here is iwconfig: root@edison:~# iwconfig wlan0 wlan0 IEEE 802.11abgn ESSID:"pi-ad-hoc" Mode:Ad-Hoc Frequency:2.427 GHz Cell: 3A:41:3D:F5:20:A2 Tx-Power=31 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:on Here is iwlist scan (strangly it shows **more then one network** with same name): Cell 01 - Address: 3A:41:3D:F5:20:A2 Channel:4 Frequency:2.427 GHz (Channel 4) Quality=70/70 Signal level=-4 dBm Encryption key:off ESSID:"pi-ad-hoc" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Ad-Hoc Extra:tsf=0000002153a8a359 Extra: Last beacon: 90ms ago IE: Unknown: 000970692D61642D686F63 IE: Unknown: 010882848B962430486C IE: Unknown: 030104 ... Cell 06 - Address: 2E:5D:62:E8:17:46 Channel:4 Frequency:2.427 GHz (Channel 4) Quality=70/70 Signal level=0 dBm Encryption key:off ESSID:"pi-ad-hoc" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Ad-Hoc Extra:tsf=00000021521e98ce Extra: Last beacon: 25920ms ago IE: Unknown: 000970692D61642D686F63 IE: Unknown: 010882848B962430486C IE: Unknown: 030104 ... Cell 08 - Address: 0A:27:49:3D:49:E9 Channel:4 Frequency:2.427 GHz (Channel 4) Quality=70/70 Signal level=0 dBm Encryption key:off ESSID:"pi-ad-hoc" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Ad-Hoc Extra:tsf=0000002153313756 Extra: Last beacon: 7920ms ago IE: Unknown: 000970692D61642D686F63 IE: Unknown: 010882848B962430486C IE: Unknown: 030104 ... Cell 09 - Address: E2:32:E6:6A:CC:A9 Channel:4 Frequency:2.427 GHz (Channel 4) Quality=70/70 Signal level=0 dBm Encryption key:off ESSID:"pi-ad-hoc" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Ad-Hoc Extra:tsf=0000002153a96297 Extra: Last beacon: 40ms ago IE: Unknown: 000970692D61642D686F63 Here is ping: root@edison:~# ping 192.168.2.2 PING 192.168.2.2 (192.168.2.2): 56 data bytes ^C --- 192.168.2.2 ping statistics --- 8 packets transmitted, 0 packets received, 100% packet loss root@edison:~# ping 192.168.2.1 PING 192.168.2.1 (192.168.2.1): 56 data bytes ^C --- 192.168.2.1 ping statistics --- 7 packets transmitted, 0 packets received, 100% packet loss root@edison:~# And here for the one of that do work: ==== ping: pi@pi3-2:~ $ ping 192.168.2.1 PING 192.168.2.1 (192.168.2.1) 56(84) bytes of data. 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=8.13 ms 64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=6.99 ms 64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=7.80 ms 64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=7.39 ms ^C --- 192.168.2.1 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3004ms rtt min/avg/max/mdev = 6.998/7.584/8.138/0.441 ms pi@pi3-2:~ $ ping 192.168.2.50 PING 192.168.2.50 (192.168.2.50) 56(84) bytes of data. ^C --- 192.168.2.50 ping statistics --- 9 packets transmitted, 0 received, 100% packet loss, time 7999ms ifconfig: pi@pi3-2:~ $ ifconfig wlan0 wlan0 Link encap:Ethernet HWaddr b8:27:eb:67:07:fc inet addr:192.168.2.2 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::ac7f:b393:aac1:78bf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1528 Metric:1 RX packets:1287637 errors:0 dropped:158601 overruns:0 frame:0 TX packets:487835 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:91775299 (87.5 MiB) TX bytes:46478896 (44.3 MiB) iwconfig pi@pi3-2:~ $ iwconfig wlan0 IEEE 802.11bgn ESSID:"pi-ad-hoc" Mode:Ad-Hoc Frequency:2.427 GHz Cell: 3A:41:3D:F5:20:A2 Tx-Power=31 dBm Retry short limit:7 RTS thr:off Fragment thr:off Power Management:on iwlist wlan0 scan pi@pi3-2:~ $ iwlist wlan0 scan wlan0 Scan completed : Cell 01 - Address: 3A:41:3D:F5:20:A2 Channel:4 Frequency:2.427 GHz (Channel 4) Quality=70/70 Signal level=-35 dBm Encryption key:off ESSID:"pi-ad-hoc" 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 Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s 24 Mb/s; 36 Mb/s; 54 Mb/s Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s Mode:Ad-Hoc Extra:tsf=0000000000000000 Extra: Last beacon: 154751220ms ago IE: Unknown: 000970692D61642D686F63 IE: Unknown: 010882848B960C121824 IE: Unknown: 030104 IE: Unknown: 06020000 IE: Unknown: 32043048606C IE: Unknown: DD070050F202000100 IE: Unknown: 010882848B962430486C IE: Unknown: 2A0100 IE: Unknown: 32040C121860 IE: Unknown: 2D1A21001FFF00000000000000000000000000000000000000000000 IE: Unknown: 3D1604001300000000000000000000000000000000000000 IE: Unknown: DD09001018020010000000