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I have recently installed Ubuntu 14.04 LTS and my LAN Internet is not working. My wifi is working properly but I can access LAN Internet.

First it keep connecting but later it says you are now offline. On my windows 8 it is working fine.

Can anybody please help.

Here are the results of ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 20:89:84:40:63:01  
          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:16

Here are the sittings of my window 8 and how they look like:

Ethernet: Ethernet Tab

Broadband: Broadband Tab

More Link you can find in the @Rishabh answer.

user3228030
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  • try from the terminal: `ifconfig eth0`, and provide the result – Малъ Скрылевъ Dec 16 '14 at 10:12
  • I have added Sir. Please review. – user3228030 Dec 16 '14 at 10:43
  • Could you please elaborate a little more about your network. As in, you have a DHCP service which issues IP or you're configuring IP's manually. Further, please post the output of `cat /etc/network/interfaces` :) – AzkerM Dec 16 '14 at 10:48
  • yes I am configuring manually as I need to provide user name and password for authentication to connect to LAN. – user3228030 Dec 16 '14 at 10:59
  • The command you provided says: no such file or directory. – user3228030 Dec 16 '14 at 11:00
  • Try again > `cat /etc/network/interfaces` Further, what you meant by authentication?? Could you explain that as well? – AzkerM Dec 16 '14 at 11:06
  • @user3228030 how did you do that? i.e. setup LAN with username and password? – Малъ Скрылевъ Dec 16 '14 at 11:11
  • @AzkerM I mean I create DSL connection from EDIT Connection and in the DSL tab I put my username and password. Because my provider setup some username password in order to get connected with internet connection. I have put this info as well. – user3228030 Dec 16 '14 at 11:18
  • @МалъСкрылевъ Yes Sir. I create new connection using Edit Connection tab and there I press Add and then Selects DSL first from drop-down and then put my information in the DSL tab like my username and password because without this info I cant get linked with provider internet. – user3228030 Dec 16 '14 at 11:19
  • So, its basically a PPPoE, thus the connectivity is through a LAN medium. Could you use delete those profiles under **DSL** tab and then try the command line method. Open up a terminal & type `sudo pppoeconf` , then follow the steps. If you're lost or you wanna look back, refer official ubuntu [**ADSLPPPoE**](https://help.ubuntu.com/community/ADSLPPPoE). – AzkerM Dec 16 '14 at 11:24
  • that is DSL, that is not LAN. – Малъ Скрылевъ Dec 16 '14 at 11:24
  • @МалъСкрылевъ Dear Sir, Basically they have provided me the LAN cable only to get connected with the internet so I said this. Sorry for misunderstanding. So, any fix? thank you for you great help so far. – user3228030 Dec 16 '14 at 11:25
  • @AzkerM So, doing this can fix my internet? – user3228030 Dec 16 '14 at 11:27
  • @AzkerM you are right in saying this. It is this sort of internet. :) – user3228030 Dec 16 '14 at 11:28
  • @AzkerM thank you much for your great help so far. – user3228030 Dec 16 '14 at 11:29
  • Doing the terminal way worked for you?? If so, please comment. Either, let me find a dupe or a I'll post it an answer for you to accept. – AzkerM Dec 16 '14 at 11:37
  • No it didn't worked for me. Please find a dupe and post your answer so I will try again. Thank you please. – user3228030 Dec 16 '14 at 11:45
  • @user3228030 could you answer two question: 1) provide output for `ifconfig|grep "Link encap:"`; 2) have you an embedded device for DSL modem? – Малъ Скрылевъ Dec 16 '14 at 12:58
  • @МалъСкрылевъ Sir, output is: `eth0 Link encap:Ethernet HWaddr 20:89:84:40:63:01 lo Link encap:Local Loopback wlan0 Link encap:Ethernet HWaddr 68:94:23:fc:b2:67 ` – user3228030 Dec 16 '14 at 19:02
  • @МалъСкрылевъ 2nd answer: Yes I do have embedded device for DSL Modem. – user3228030 Dec 16 '14 at 19:03
  • @AzkerM I have used your commands it says 2 test unsuccessful. Not connected. this type of error. any trick? – user3228030 Dec 16 '14 at 19:04
  • @МалъСкрылевъ Added screenshots of windows 8. I have these sittings without any manual entries. I only creates broadband connection myself to enter username password. – user3228030 Dec 16 '14 at 19:22
  • @AzkerM the response of `sudo pppoeconf` command is: `Sorry, I scanned 2 interfaces, but the Access │ │ Concentrator of your provider did not respond. Please │ │ check your network and modem cables. Another reason for │ │ the scan failure may also be another running pppoe │ │ process which controls the modem.` – user3228030 Dec 17 '14 at 10:18
  • These comments are getting quite messy, can you [edit] your question to include any essential information they might contain so we can clean them up? Thanks. – Seth Dec 22 '14 at 00:43

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Can you attach the screenshots for ifconfig command (in ubuntu), can you also attach a screenshot of your windows 8 LAN details?

just go to Network and sharing centre > Local area Connection > Details

Your network connection is not getting connected automatically because it is a broadband connection. You need to manually set it up

Take a look at - How to set up broadband connection in Ubuntu 14.04 Desktop version , it might be a possible duplicate to your question and respond if that method works

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Rishabh
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