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I have a Sony Vaio VPCCB22FX running 12.04 and I'm trying to connect to my home router which is a Linksys WRT310N.

The connection is supposed to be OK. I connect to the router and I actually received an IP address correctly but I can't get into the Internet. I can't even ping my default gateway (Linksys Router). What could be the problem?

The router has connectivity to the Internet because I can use another computer and connect to that same router without problems. I can't ping my laptop from the router either.

Please, any ideas? I'm a Ubuntu newbie. Appreciate all the help.

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Does the result from "ifconfig" show two sections, one for "eth0" and one for "lo"? If so, is the "inet addr" for eth0 the same network as your other computer (all number the same except the last)? You might also try entering this command: nmcli dev list iface eth0 | grep IP4, and making sure everything is what you expect (you can post the results if you want). You should be able to ping all the addresses shown in the result. –  Marty Fried May 29 '12 at 4:52
    
Ok, so this is what I get from the "ifconfig" eth0 Link encap:Ethernet HWaddr f0:bf:97:65:00:76 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:50 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:1245 errors:0 dropped:0 overruns:0 frame:0 TX packets:1245 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 –  Daniel Porras May 30 '12 at 2:32
    
Is there a way to make my answer bigger? LOL is just that I couldn't publish everything I had to say hahaha –  Daniel Porras May 30 '12 at 2:37
    
One thing that's missing from the "eth0" section is the "inet addr", among other things. It seems like there is no ip address for some reason. Did you definitely connect successfully? You probably should check the "Network Connections" setup (right-click network on panel, choose "edit connections"). –  Marty Fried May 30 '12 at 3:11
    
Got it!!! The computer and the router for some weird reason were not syncing the radio!! My laptop was using G and the router using N. After a while of reading packages with wireshark I found it haha. Thanks a lot!! –  Daniel Porras May 30 '12 at 4:13
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You can use command in terminal sudo -i then root password and another command pppoeconf and give your username and password provided by your ISP and enjoy Internet.

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sudo -i takes the user's own password (created when they installed Ubuntu), not the root password, which typically doesn't exist. Also, what's the advantage of this method over just running sudo pppoeconf? –  Eliah Kagan Aug 26 '12 at 5:26
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