Bdtyktl

Let me start with a disclaimer: I have tried to fix my problem by reading similar questions & answers, but so far no luck. Not only that, but I think that by making some changes to resolvconf I have messed it up further. I need someone to take me by the hand and help me fix this issue, I would be immensely grateful!

The situation is this: I am living in a building where the internet is provided by the university's network. Recently, some upgrades where done to the network, after which all my connectivity issues arose.

My Windows desktop PC will connect properly when using the same connection, no issues there. MY 14.04 ubuntu laptop, however, shows a normal connection to my router (wired or wirelessly, both work) but I am then unable to browse to any webpage.

Symptoms:
- Can ping IP addresses but not websites (DNS issues?)
- I can ssh to a server that I know is based at the university, so on the same network, and through there, I can use firefox to browse.

In case those are helpful, I will post below the output of ifconfig, and the contents of /etc/resolv.conf, which I think needs to be completely reconfigured after my failed attempts.

ifconfig:

eth0      Link encap:Ethernet  HWaddr b8:88:e3:84:1a:0e  

          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 



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:65536  Metric:1

          RX packets:12843 errors:0 dropped:0 overruns:0 frame:0

          TX packets:12843 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:826185 (826.1 KB)  TX bytes:826185 (826.1 KB)



wlan0     Link encap:Ethernet  HWaddr 20:68:9d:74:97:54  

          inet addr:192.168.2.100  Bcast:192.168.2.255  Mask:255.255.255.0

          inet6 addr: fe80::2268:9dff:fe74:9754/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:216847 errors:0 dropped:0 overruns:0 frame:0

          TX packets:194916 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:40559273 (40.5 MB)  TX bytes:25893877 (25.8 MB)

Content of /etc/resolv.conf:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 127.0.1.1

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

nameserver 127.0.1.1

nameserver 8.8.8.8

nameserver 8.8.4.4

EDIT: nm-tool output:

NetworkManager Tool



State: connected (global)



- Device: eth0 -----------------------------------------------------------------

  Type:              Wired

  Driver:            alx

  State:             unavailable

  Default:           no

  HW Address:        B8:88:E3:84:1A:0E



  Capabilities:

    Carrier Detect:  yes

    Speed:           100 Mb/s



  Wired Properties

    Carrier:         off





- Device: wlan0  [ICIDU] -------------------------------------------------------

  Type:              802.11 WiFi

  Driver:            ath9k

  State:             connected

  Default:           yes

  HW Address:        20:68:9D:74:97:54



  Capabilities:

    Speed:           1 Mb/s



  Wireless Properties

    WEP Encryption:  yes

    WPA Encryption:  yes

    WPA2 Encryption: yes



  Wireless Access Points (* = current AP)

    wifiwifi:        Infra, C0:4A:00:84:6B:5C, Freq 2422 MHz, Rate 54 Mb/s, Strength 25 WPA2

    Sitecom1E55CA:   Infra, 64:D1:A3:1E:55:CA, Freq 2472 MHz, Rate 54 Mb/s, Strength 17 WPA2

    VosHotSpot:      Infra, 00:23:54:08:02:8A, Freq 2412 MHz, Rate 54 Mb/s, Strength 29 WEP

    Pritty fly for a wifi: Infra, 08:60:6E:E2:93:50, Freq 2437 MHz, Rate 54 Mb/s, Strength 15 WPA2

    @Home41596:      Infra, 00:14:6C:9A:D4:5C, Freq 2437 MHz, Rate 54 Mb/s, Strength 14 WPA

    Pauw2:           Infra, 00:1C:10:2F:B3:3C, Freq 2462 MHz, Rate 54 Mb/s, Strength 7 WPA

    belkin54g:       Infra, 00:17:3F:46:FF:7A, Freq 2462 MHz, Rate 54 Mb/s, Strength 5 WPA

    Sitecom057D42:   Infra, 64:D1:A3:05:7D:42, Freq 2447 MHz, Rate 54 Mb/s, Strength 19 WPA2

    Indigo Plateau:  Infra, 00:0C:F6:55:BE:B8, Freq 2462 MHz, Rate 54 Mb/s, Strength 17 WPA

    NZ:              Infra, 48:F8:B3:28:C2:09, Freq 2462 MHz, Rate 54 Mb/s, Strength 5 WPA WPA2

    MAX-PC_Network:  Infra, 6C:FD:B9:53:CA:68, Freq 2427 MHz, Rate 54 Mb/s, Strength 10 WPA WPA2

    *ICIDU:          Infra, 80:1F:02:A4:9E:BC, Freq 2462 MHz, Rate 54 Mb/s, Strength 89 WPA2

    Zadnuk:          Infra, 00:01:E3:C3:C0:61, Freq 2437 MHz, Rate 54 Mb/s, Strength 15 WEP

    Studententehuis: Infra, 98:FC:11:B1:AC:99, Freq 2462 MHz, Rate 54 Mb/s, Strength 7 WPA2



  IPv4 Settings:

    Address:         192.168.2.100

    Prefix:          24 (255.255.255.0)

    Gateway:         192.168.2.1



    DNS:             192.168.2.1

Cheers,
ArcM

• Keep your network cable plugged in.


• In Network Manager disconnect from your network


• 
  

  Set /etc/resolv.conf to these 3 lines:

  
  
  

  # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
  
  #     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
  
  nameserver 127.0.0.1
  
  

  
  

(Note: 127.0.0.1 instead of 127.0.1.1)

• In Network Manager connect to your wired network

Once you do that DHCP should pick up the right configuration - pretty much the same way Windows computers do.

Edit

It looks like your dnsmasq is somehow broken. dnsmasq is a local caching name server, it remembers the IP addresses of web sites and next time you request them it provides the answer rather than the request going to the network name server. To verify whether this is the case edit file /etc/NetworkManager/NetworkManager.conf and comment out (put # in front of) line dns=dnsmasq. Then use NM to disconnect from your wired connection and connect again. Let us know what happens.

I had the exact problem. I could connect with win7 machine, but i could not connect with ubuntu 14.04 machine with university network although i had adjust the same setting.

After 2 days examine, I understood that automatic proxy settings does work on win7 machine but it does not work on ubuntu.

So, first you need to find an internet connected machine and type

chrome://net-internals/#proxy

in the google-chrome address bar. Under effective proxy settings headline you should see Pac script address. Please note down this address.

You should click system Settings->Network->Network proxy in Ubuntu machine.
After you should select Automatic as Method, you should type pac script that you have just notted.

And last, you should click Apply system wide button.

After reset the connection, you can reach internet.