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Thread: Mobile Broadband - DNS trouble?

  1. #1
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    Mobile Broadband - DNS trouble?

    Hello!

    I am running Ubuntu 9.10 on two different laptops, both show the same problem when connecting to the internet through mobile broadband with a Huawei 220 modem: the connection is established, but if I try to open a web page in firefox, it can not connect. However, the "Weather Report" panel application can update its content. Using wireshark to monitor the ppp interface, I can see the traffic for the wheater report, but no traffic at all coming from firefox - also no DNS packets. If I directly type an IP address into the firefox address line, I see outgoing but no incoming packets. The weirdest thing is that *sometimes* everything works fine! But most of the time the behaviour is as described.

    I assume, something goes wrong with the DNS (nslookup does not work then) but I can not figure out what.

    Can you help me?

    Regards,

    geokom

  2. #2
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    Re: Mobile Broadband - DNS trouble?

    Ah, I forgot: one of the laptops has also Window XP installed - no problems there.

  3. #3
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    Re: Mobile Broadband - DNS trouble?

    Hi

    sounds like problem with network manager

    *****from a fresh boot otherwise the sys log is to long*****

    can you do this from the terminal and post the results

    also did the device configure in the wizard ok



    Code

    lsusb


    and then



    ls -al /dev/ttyU*

    and then

    tail -f /var/log/syslog

    there are links on this site regarding this device so may be able to point in right direction
    Last edited by alexfish; December 5th, 2009 at 02:10 PM. Reason: forgot to add tail -f /var/log/syslog /do from fresh boot

  4. #4
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    Re: Mobile Broadband - DNS trouble?

    Hi Everyone, and Alex (fish)

    I am having the same problem.
    I was posting my troubleshooting results here:
    http://ubuntuforums.org/showthread.php?t=1379736
    Alex was helping out.
    It took me a while to realise that it was a problem in using the DNS.

    I wonder where to go now?

    By the way, I found a bug listed now:

    https://bugs.launchpad.net/ubuntu/+s...fo/+bug/498110

    Its status is currently (thankfully) confirmed.
    Last edited by svaens; January 13th, 2010 at 11:36 PM. Reason: additional info

  5. #5
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    Re: Mobile Broadband - DNS trouble?

    hi

    had to do some reading re all these post like this above re: network manager

    for the time been;

    I am placing here a very useful link regarding the PPP

    the link will take you to a specific page ..

    don't forget to read the previous pages

    Because This Concerns the Network Manager

    I think posting here about this subject would be welcome by All members
    " what ever their means of connection happens to be "

    the ppp link

    http://tldp.org/HOWTO/PPP-HOWTO/c1337.html
    Last edited by alexfish; January 15th, 2010 at 02:04 AM.
    Two tin cans are better than an iphone

    http://www.ehow.co.uk/how_2067160_ma...hone.html?cr=1

  6. #6
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    Re: Mobile Broadband - DNS trouble?

    Linux: Setup as DNS Client / Name Server IP Address


    Many new Linux user finds it difficult to setup / modify new name server address (NS1 / NS2).
    Local name resolution is done via /etc/hosts file. If you have small network, use /etc/hosts file. DNS (domain name service is accountable for associating domain names with ip address, for example domain yahoo.com is easy to remember than IP address 202.66.66.12) provides better name resolution. To configure Linux as DNS client you need to edit or modify /etc/resolv.conf file. This file defines which name servers to use. You want to setup Linux to browse net or run network services like www or smtp; then you need to point out to correct ISP DNS servers:

    /etc/resolv.conf file

    if using Ubuntu ppp then try using the /etc/ppp/resolv.conf file

    In Linux and Unix like computer operating systems, the /etc/resolv.conf configuration file contains information that allows a computer connected to the Internet to convert alpha-numeric names into the numeric IP addresses that are required for access to external network resources on the Internet. The process of converting domain names to IP addresses is called "resolving."
    The resolv.conf file typically contains the IP addresses of nameservers (DNS name resolvers) that attempt to translate names into addresses for any node available on the network.

    Setup DNS Name resolution

    Steps to configure Linux as DNS client, first login as a root user (use sudo su command):

    Step # 1: Open /etc/resolv.conf file:

    vi /etc/resolv.conf ; or gedit

    Step #2:
    Add your ISP nameserver as follows: Example

    search isp.com
    nameserver 202.54.1.110
    nameserver 202.54.1.112
    nameserver 202.54.1.115

    Note Max. three nameserver can be used/defined at a time.

    Step # 3:Test setup nslookup or dig command:

    dig "name" IE: dig custard.bris.ac.uk ; dig myAPN

    nslookup "name"

    .................................................. .................................................
    Last edited by alexfish; April 21st, 2010 at 10:23 AM. Reason: example
    Two tin cans are better than an iphone

    http://www.ehow.co.uk/how_2067160_ma...hone.html?cr=1

  7. #7
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    Re: Mobile Broadband - DNS trouble?

    Hi

    If you have followed the above the inevitable seems to happen again "nothing in the/etc/resolv.conf "

    this what I Have done

    1. installed Ubuntu Tweak for here

    http://ubuntu-tweak.com/





    2. From the Menus in Ubuntu Tweak There is a Package cleaner. came up with this, screen shot below

    look up on the web here

    http://live.gnome.org/PolicyKit

    PolicyKit is a framework for defining policy for system-wide components and for desktop pieces to configure it. It is currently used by several components of the GNOME desktop, among which GConf, NetworkManager, the gnome-system-tools. GNOME does not depend on PolicyKit1 itself, but on polkit-gtk-1. Please note that version 1 is not compatible with its predecessors (versions below 0.92).

    Yep, I cleaned up the System step by step from the menus in Ubuntu Tweak

    From the Menu Package Cleaner Here are the options

    Clean Package

    Clean Cache

    Clean Config

    Clean Kernel

    Can't say if it is a solution , but I have done a fresh install of Ubuntu 9.10 and have used this after every upgrade or update and have had good success with the network manager (the fresh install was a while back)
    Attached Images Attached Images
    Last edited by alexfish; January 17th, 2010 at 04:57 PM. Reason: fresh install a while back
    Two tin cans are better than an iphone

    http://www.ehow.co.uk/how_2067160_ma...hone.html?cr=1

  8. #8
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    Re: Mobile Broadband - DNS trouble?

    thanks Alex; a bit of homework for us all

    we appreciate all your very diligent research; great work

  9. #9
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    Re: Mobile Broadband - DNS trouble?

    Quote Originally Posted by pdc View Post
    thanks Alex; a bit of homework for us all

    we appreciate all your very diligent research; great work
    and more Sorry

    http://live.gnome.org/NetworkManager/MobileBroadband

    http://live.gnome.org/DarrenAlbers/NetworkManagerFAQ

    http://live.gnome.org/NetworkManager/Debugging
    Last edited by alexfish; January 15th, 2010 at 05:47 PM. Reason: debug page
    Two tin cans are better than an iphone

    http://www.ehow.co.uk/how_2067160_ma...hone.html?cr=1

  10. #10
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    Re: Mobile Broadband - DNS trouble?

    Does anyone know if the problem still exists with ubuntu 10.04?

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