Realtek wireless works on all APs except for my WRT54G2

[holotone]

My Toshiba a215-s5808 laptop has a wireless card that appears to work everywhere I've tried it but (of course) at my own house, which serves cable internet through a Linksys WRT54G2. Odd thing is, the AP gives me an IP address and the connection information all appears just fine. No network access though - I can't ping anything, including the gateway.

lspci lists the ethernet controller as 'RTL8202E/RTL8202E'

According to 'sudo lshw -C network', I'm using the r8169 driver

The AP sees me in it's client table and does not indicate any issues, and many other Windows and Ubuntu clients use this AP with no problem at all. Completely resetting the router to completely default configuration with no security does not resolve the problem.

This is driving me nuts - HALP!

[holotone]

Anyone?

[holotone]

Any suggestions as to how I can start troubleshooting this problem? I've searched the web for days, asked on IRC numerous times, and have come up with nothing but silence - I'm feeling really stuck here. Any help would be seriously appreciated...

[holotone]

Am I posting in the wrong sub-forum or something?

[holotone]

Maybe I just smell.. You'd tell me if I smelled, right?

[holotone]

Would there be a better way to ask the question? Can someone at least suggest an alternative place to get help?

[dbalascak]

Is there a MAC address filter on the WRT54G? That would allow you to connect, receive an IP address ( if you're using DHCP ) and appear on the LAN, but would drop all packets from your MAC.

[holotone]

Is there a MAC address filter on the WRT54G? That would allow you to connect, receive an IP address ( if you're using DHCP ) and appear on the LAN, but would drop all packets from your MAC.

I checked to make sure MAC address filtering wasn't abled and reset the AP itself back to factory defaults, no security. Still no dice.

Thanks for the response!

[TransitMan]

Did you input the requested WPA2 password for connection between you and the router?
If not, then you will get nowhere.

I had a Dell Netbook here recently, and had to set the IP to a static address, gateway to the router, and DNS to the router. The input the proper password for security/WPA2 and after about 2 minutes was good to go.

Double check your settings at home. From your post, it sounds like you surfed opened AP's and yours is password protected, like it should be.

[holotone]

Did you input the requested WPA2 password for connection between you and the router?
If not, then you will get nowhere.

I had a Dell Netbook here recently, and had to set the IP to a static address, gateway to the router, and DNS to the router. The input the proper password for security/WPA2 and after about 2 minutes was good to go.

Double check your settings at home. From your post, it sounds like you surfed opened AP's and yours is password protected, like it should be.

Thanks for your suggestions, TransitMan - Like I said, I've both disabled WPA security on the AP and completely reset the AP to factory defaults - That is to say that this problem occurs even when the AP is completely unsecured and back in its standard, default, fresh-out-of-the-box configuration.

I'm getting an IP address and the AP sees me in it's clients table, so I don't think that setting static IPs is the solution (though I have tried that too!).

[holotone]

Any other suggestions?

[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

[holotone]

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:

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:

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:

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

Thanks, dbalascak!!

[holotone]

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]

Is there maybe a different driver I can try?

[holotone]

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)? (http://www.reddit.com/r/AskReddit/comments/9huc0/when_was_the_last_time_you_had_a_computer_problem/)

[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.



$ 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]

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.



$ 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]

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.php?t=1223154&highlight=WRT54G2

[dbalascak]

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?