Why wireless adatper stop to work?
- by AndreaNobili
today I correctly installed the driver for the TP-LINK TL-WN725N USB wireless adapter on my RaspBerry Pi (I use RaspBian that is a Debian), then I setted up the wifi using the wpa-supplicant as explained in this tutorial:
http://www.maketecheasier.com/setup-wifi-on-raspberry-pi/
This worked fine untill this evening. Then suddenly it stopped to work when I try to connect in SSH and the Raspberry is on the wireless (or rather it should be, as this is not in the list of my router's DHCP connected Client)
The strange thing is that the USB wirless adapter blink so I think that this is not a driver problem.
If I try to connect it by the ethernet I have no problem. It appear in my router's DHCP connected Client and I can connect to it by SSH.
When I connect to it using ethernet if I perform an ifconfig command I obtain:
pi@raspberrypi ~ $ ifconfig
eth0 Link encap:Ethernet HWaddr b8:27:eb:2a:9f:b0
inet addr:192.168.1.9 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:48 errors:0 dropped:0 overruns:0 frame:0
TX packets:59 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6006 (5.8 KiB) TX bytes:8268 (8.0 KiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1104 (1.0 KiB) TX bytes:1104 (1.0 KiB)
wlan0 Link encap:Ethernet HWaddr e8:94:f6:19:80:4c
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
So it seems that the wlan0 USB wireless adapter driver is correctly loaded.
If I remove the USB wireless adapter and put it again into the USB port, the lasts lines of dmesg log is:
[ 20.303172] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup
[ 20.306340] RTL871X: set bssid:00:00:00:00:00:00
[ 20.306726] RTL871X: set ssid [g\xffffffc6isQ\xffffffffJ\xffffffec)\xffffffcd\xffffffba\xffffffba\xffffffab\xfffffff2\xfffffffb\xffffffe3F|\xffffffc2T\xfffffff8\x1b\xffffffe8\xffffffe7\xffffff8dvZ.c3\xffffff9f\xffffffc9\xffffff9a\xffffff9aD\xffffffa7\x1a\xffffffa0\x1a\xffffff8b] fw_state=0x00000008
[ 21.614585] RTL871X: indicate disassoc
[ 21.908495] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
[ 25.006282] Adding 102396k swap on /var/swap. Priority:-1 extents:1 across:102396k SSFS
[ 26.247997] RTL871X: nolinked power save enter
As you can see some of these line are related to the RTL871X that is my USB wireless adapter, but I don't know is that these line report an error or if it is all ok.
Looking at the adapter status I obtain:
pi@raspberrypi ~ $ ip link list dev wlan0
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT qlen 1000
link/ether e8:94:f6:19:80:4c brd ff:ff:ff:ff:ff:ff
As you can see the mode is DORMANT but I think that this is normal because now I am connected using ethernet.
I tryied to set up the adapter but it seems that I obtain no result, infact:
pi@raspberrypi ~ $ sudo ip link set dev wlan0 up
pi@raspberrypi ~ $ ip link list dev wlan0
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT qlen 1000
link/ether e8:94:f6:19:80:4c brd ff:ff:ff:ff:ff:ff
pi@raspberrypi ~ $ sudo ip link set dev wlan0 up
This is my /etc/network/interfaces file content and it is ok:
auto lo
iface lo inet loopback
iface eth0 inet dhcp
allow-hotplug wlan0
iface wlan0 inet manual
wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf
iface default inet dhcp
and it is the /etc/wpa_supplicant/wpa_supplicant.conf that I think is ok (I did not change it compared to when it worked):
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="MY-NETWORK"
psk="mypassword"
key_mgmt=WPA-PSK
}
and infact if I execute a network scan I correctly find MY-NETWORK in the network list,infact:
pi@raspberrypi ~ $ sudo iwlist wlan0 scan | grep ESSID
ESSID:"TeleTu_74888B0060AD"
ESSID:"MY-NETWORK"
ESSID:"FASTWEB-1-PT6NtjL4TOSe"
ESSID:"DC"
So I reboot the system and I remove the ethernet cable but when I try to connect again to my raspberry I obatin the following error message:
andrea@andrea-virtual-machine:~$ sudo ssh [email protected]
ssh: connect to host 192.168.1.9 port 22: No route to host
It seems that it can't connect using wireless.
What could be the problem? What am I missing? How can I solve this situation?
Tnx
