Problem :
I have two Raspberry Pi machines with D-link DWA-121 Wi-Fi adapters and I’m trying to set up an ad-hoc network between them.
I have followed this configuration example in /etc/network/interfaces:
auto lo
iface lo inet loopback
iface eth0 inet dhcp
auto wlan0
iface wlan0 inet static
address 192.168.3.10
netmask 255.255.255.0
wireless-channel 1
wireless-essid wnet
wireless-mode ad-hoc
I used a vanilla Raspbian 2015-01-31 and the settings are the same for both, except for the last digit of the IP address, but I can’t ping between them. The strange thing is that if I connect an Android device to the same network then it can ping both of them. Also both Raspberry Pi machines can ping the Android device, but not eachother.
This is the output of ifconfig, iwconfig and route:
pi@CCV2XA:~$ ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 6c:19:8f:b7:52:a1
inet addr:192.168.3.10 Bcast:192.168.3.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:105 errors:0 dropped:7 overruns:0 frame:0
TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6852 (6.6 KiB) TX bytes:816 (816.0 B)
pi@CCV2XA:~$ iwconfig wlan0
wlan0 IEEE 802.11bg ESSID:"wnet" Nickname:"<WIFI@REALTEK>"
Mode:Ad-Hoc Frequency:2.412 GHz Cell: 02:11:87:B2:93:FF
Bit Rate:54 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Power Management:off
Link Quality=100/100 Signal level=100/100 Noise level=0/100
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
pi@CCV2XA:~$ route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.3.0 * 255.255.255.0 U 0 0 0 wlan0
Have I forgotten something in the IP setup?
Solution :
There appears to be a bug in the Realtek 8192cu Linux driver. The same configuration works if a different adapter is used on one of the machines.