Realtek wireless works on all APs except for my WRT54G2

**holotone** · September 2nd, 2009

Any other suggestions?

**dbalascak** · September 2nd, 2009

So what does the network look like. Any other active or nonactive interfaces? Are you running a firewall?
Post
netstat -rn
ifconfig -a
cat /etc/network/interfaces

**holotone** · September 3rd, 2009

Originally Posted by dbalascak

So what does the network look like. Any other active or nonactive interfaces? Are you running a firewall?
Post
netstat -rn
ifconfig -a
cat /etc/network/interfaces

It's a super simple network - A cable modem receives WAN and passes it on to a WRT54G2 which broadcasts it wirelessly. No firewall anywhere on the network.

While connected to the problem AP...

netstat -rn:

Code:

molly@andorifthen:~$ netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 wlan0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 wlan0
0.0.0.0         192.168.1.1     0.0.0.0         UG        0 0          0 wlan0

ifconfig -a:

Code:

molly@andorifthen:~$ ifconfig -a
eth0      Link encap:Ethernet  HWaddr 00:a0:d1:93:4d:63  
          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:252 Base address:0xe000 

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: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:440 (440.0 B)  TX bytes:440 (440.0 B)

pan0      Link encap:Ethernet  HWaddr 06:48:ca:ef:c4:e5  
          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:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

wlan0     Link encap:Ethernet  HWaddr 00:16:44:8a:ec:06  
          inet addr:192.168.1.104  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::216:44ff:fe8a:ec06/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14 errors:0 dropped:0 overruns:0 frame:0
          TX packets:51 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1994 (1.9 KB)  TX bytes:8278 (8.2 KB)

wmaster0  Link encap:UNSPEC  HWaddr 00-16-44-8A-EC-06-63-30-00-00-00-00-00-00-00-00  
          UP BROADCAST RUNNING 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)

cat /etc/network/interfaces:

Code:

molly@andorifthen:~$ cat /etc/network/interfaces
auto lo
iface lo inet loopback

Thanks, dbalascak!!

**holotone** · September 4th, 2009

I'm not sure if it's relevant, but the output of those commands is the same when I'm connected to any other AP.

**holotone** · September 5th, 2009

Is there maybe a different driver I can try?

**holotone** · September 6th, 2009

Cross-posted to:
When was the last time you had a computer problem that nobody else in the *world* had (according to multiple google searches)?

**dbalascak** · September 6th, 2009

Your wireless interface show packets sent and received. Check and see it your IPtables is blocking anything. This is what sould be seen if there are no blocking rules.

Code:

$ sudo iptables -L 


Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

**holotone** · September 6th, 2009

Originally Posted by dbalascak

Your wireless interface show packets sent and received. Check and see it your IPtables is blocking anything. This is what sould be seen if there are no blocking rules.

Code:

$ sudo iptables -L 


Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

My output looks exactly like yours - Like I'd mentioned before, the wireless on this laptop works fine except when I'm connected to this very specific AP. Every other computer that connects to the problem AP (Ubuntu or otherwise) works exactly as expected.

**bkratz** · September 6th, 2009

In your searches did you see this? It seems relevant, once he was able to connect to the router wired he was also able to connect wirelessly.

http://ubuntuforums.org/showthread.p...hlight=WRT54G2

**dbalascak** · September 6th, 2009

Your interface is receiving and sending packets. You have other systems on the same WRT54G2 that are working? Confirm that you are on the correct WAP by doing an iwconfig. Execute the command sudo tcpdump -i wlan0. This command will display (continuously) packets sent and received on the interface wlan0. From another machine or the WRTG54G2 do a ping. Do you see the packets in the tcpdump window? They will be ICMP Echo packtes.

Open a second terminal and ping the default router. Are the packets leaving displayed in the tcpdump window?