my wireless usb adapter connect to net but the signal is very weak

rsd220 · February 17, 2010, 9:42am

i have wireless usb adapter rtl8187 from micromax company
my proplem is the signal is very weak and i cannot open website

can i increase the signal ?

iwconfig

 lo        no wireless extensions.
 

 eth0      no wireless extensions.
 

 wmaster0  no wireless extensions.
 

 wlan0     IEEE 802.11bg  ESSID:"Dentistry"   
           Mode:Managed  Frequency:2.412 GHz  Access Point: 00:90:D0:F7:10:72    
           Bit Rate=24 Mb/s   Tx-Power=20 dBm    
           Retry  long limit:7   RTS thr:off   Fragment thr:off
           Power Management:off
           Link Quality=39/70  Signal level=-71 dBm   
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:0   Missed beacon:0
 

 eth1      unassociated  Mode:Managed  Frequency=2.412 GHz   
           Access Point: Not-Associated   Bit Rate:0 kb/s   Tx-Power=20 dBm    
           Sensitivity=8/0   
           Retry limit:7   RTS thr:off   Fragment thr:off
           Power Management:off
           Link Quality:0  Signal level:0  Noise level:0
           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
           Tx excessive retries:0  Invalid misc:0   Missed beacon:0

information about my adapter

      lsusb  
 Bus 002 Device 002: ID 15ca:00c3 Textech International Ltd. Mini Optical Mouse  
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub  
 Bus 001 Device 003: ID 0bda:8187 Realtek Semiconductor Corp. RTL8187 Wireless Adapter  
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub  
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

   ifconfig -a  
 ifconfig -a: command not found

          lsmod  
 Module                  Size  Used by  
 binfmt_misc             8356  1  
 ppdev                   6688  0  
 snd_intel8x0           30168  2  
 snd_ac97_codec        101216  1 snd_intel8x0  
 ac97_bus                1532  1 snd_ac97_codec  
 snd_pcm_oss            37920  0  
 snd_mixer_oss          16028  1 snd_pcm_oss  
 snd_pcm                75296  3 snd_intel8x0,snd_ac97_codec,snd_pcm_oss  
 snd_seq_dummy           2656  0  
 snd_seq_oss            28576  0  
 snd_seq_midi            6432  0  
 joydev                 10272  0  
 snd_rawmidi            22208  1 snd_seq_midi  
 pcmcia                 36808  0  
 snd_seq_midi_event      6940  2 snd_seq_oss,snd_seq_midi  
 iptable_filter          3100  0  
 arc4                    1660  2  
 snd_seq                50224  6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event  
 yenta_socket           24200  1  
 ecb                     2524  2  
 snd_timer              22276  2 snd_pcm,snd_seq  
 ip_tables              11692  1 iptable_filter  
 rsrc_nonstatic         11644  1 yenta_socket  
 snd_seq_device          6920  5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq  
 psmouse                56180  0  
 ipw2200               140292  0  
 pcmcia_core            35792  3 pcmcia,yenta_socket,rsrc_nonstatic  
 snd                    59204  14 snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device  
 libipw                 43148  1 ipw2200  
 soundcore               7264  1 snd  
 lib80211                6432  2 ipw2200,libipw  
 serio_raw               5280  0  
 rtl8187                50624  0  
 snd_page_alloc          9156  2 snd_intel8x0,snd_pcm  
 x_tables               16544  1 ip_tables  
 shpchp                 32272  0  
 mac80211              181236  1 rtl8187  
 toshiba_acpi           10744  0  
 led_class               4096  1 rtl8187  
 eeprom_93cx6            1916  1 rtl8187  
 cfg80211               93052  2 rtl8187,mac80211  
 lp                      8964  0  
 parport                35340  2 ppdev,lp  
 usbhid                 38208  0  
 fbcon                  36640  72  
 tileblit                2460  1 fbcon  
 font                    8124  1 fbcon  
 bitblit                 5372  1 fbcon  
 softcursor              1756  1 bitblit  
 i915                  221064  3  
 drm                   159584  3 i915  
 i2c_algo_bit            5760  1 i915  
 e100                   32452  0  
 mii                     5212  1 e100  
 ohci1394               29900  0  
 ieee1394               86596  1 ohci1394  
 intel_agp              27484  2 i915  
 agpgart                34988  2 drm,intel_agp  
 video                  19380  1 i915  
 output                  2780  1 video

Corona688 · February 17, 2010, 4:34pm

Your signal is a reasonable -71dBm. Either there's too much obstruction for your USB adapter to send signals back, or your connection isn't working for other reasons. Do you know if the connection is secured? Can you show me the output of 'ifconfig'?

I see also you have two wireless devices in your system, the USB one and what looks like an intel wireless adapter.

rsd220 · February 18, 2010, 4:14am

ifconfig

 	 	 eth0      Link encap:Ethernet  HWaddr 00:0e:7b:59:18:1a   
           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)  
 
 
 eth1      Link encap:Ethernet  HWaddr 00:0e:35:4d:6b:f3   
           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)  
           Interrupt:11 Base address:0xe000 Memory:cffff000-cfffffff  
 
 
 lo        Link encap:Local Loopback   
           inet addr:127.0.0.1  Mask:255.0.0.0  
           inet6 addr: ::1/128 Scope:Host  
           UP LOOPBACK RUNNING  MTU:16436  Metric:1  
           RX packets:15 errors:0 dropped:0 overruns:0 frame:0  
           TX packets:15 errors:0 dropped:0 overruns:0 carrier:0  
           collisions:0 txqueuelen:0  
           RX bytes:1371 (1.3 KB)  TX bytes:1371 (1.3 KB)  
 
 
 wlan0     Link encap:Ethernet  HWaddr 00:0c:09:70:27:0d   
           inet addr:192.168.1.69  Bcast:192.168.1.255  Mask:255.255.255.0  
           inet6 addr: fe80::20c:9ff:fe70:270d/64 Scope:Link  
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1  
           RX packets:199 errors:0 dropped:0 overruns:0 frame:0  
           TX packets:221 errors:0 dropped:0 overruns:0 carrier:0  
           collisions:0 txqueuelen:1000  
           RX bytes:62853 (62.8 KB)  TX bytes:25980 (25.9 KB)  
 
 
 wmaster0  Link encap:UNSPEC  HWaddr 00-0C-09-70-27-0D-37-30-00-00-00-00-00-00-00-00   
           UP RUNNING  MTU:0  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)

 	 the connection is not secured

Corona688 · February 18, 2010, 9:11am

Okay, you even have an IP address so you seem to be able to talk to the router... How well we don't know yet.

It could potentially be an MTU problem. Try 'ifconfig wlan0 mtu 1364' and see if that helps.

If not, post the output of 'ping -c 4 192.168.1.1' so we can see how well your system can talk to the router. Then 'ping -c 4 66.82.4.8' to see if you can actually get through to the internet at all with it.

rsd220 · February 19, 2010, 9:08am

ifconfig wlan0 mtu 1364

 	 	 rsd@rsd-laptop:~$ ifconfig wlan0 mtu 1364  
 SIOCSIFMTU: Operation not permitted  
 rsd@rsd-laptop:~$ sudo ifconfig wlan0 mtu 1364  
 [sudo] password for rsd:  
 SIOCSIFMTU: No such device

 	 ping -c 4 192.168.1.1

 	 	 rsd@rsd-laptop:~$ ping -c 4 192.168.1.1  
 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.  
 From 192.168.1.64 icmp_seq=1 Destination Host Unreachable  
 From 192.168.1.64 icmp_seq=2 Destination Host Unreachable  
 From 192.168.1.64 icmp_seq=3 Destination Host Unreachable  
 From 192.168.1.64 icmp_seq=4 Destination Host Unreachable  
 
 
 --- 192.168.1.1 ping statistics ---  
 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3014ms  
 , pipe 3

 	 ping -c 4 66.82.4.8

 	 	 rsd@rsd-laptop:~$ ping -c 4 66.82.4.8  
 PING 66.82.4.8 (66.82.4.8) 56(84) bytes of data.  
 From 192.168.1.64 icmp_seq=1 Destination Host Unreachable  
 From 192.168.1.64 icmp_seq=2 Destination Host Unreachable  
 From 192.168.1.64 icmp_seq=3 Destination Host Unreachable  
 From 192.168.1.64 icmp_seq=4 Destination Host Unreachable  
 
 
 --- 66.82.4.8 ping statistics ---  
 4 packets transmitted, 0 received, +4 errors, 100% packet loss, time 3015ms  
 , pipe 3

Corona688 · February 19, 2010, 6:27pm

It looks like you don't have a default gateway configured.

route add default gw 192.168.1.1

..either that or you've given yourself a static IP, in which case you should just switch it back to dhcp.