Network issues

Discussion in 'Network Routers' started by Iced Tea, Sep 11, 2012.

  1. Iced Tea

    Iced Tea Guest

    I have 3 computers and some other electronics (BluRay, TVs, Wii) on my home
    network, About 3 weeks ago the main computer that is running Windows XP SP3
    will lose the internet connection at the same time evey morning for about 10
    minutes. I can access the other comptuers on the network and they can access
    the one that loses the internet connection. The computer with Vista &
    Windows 7 don't have this problem.

    My network setup is the following and everything is hardwired:

    Linksys WRT54GL
    Zonet 16 port hub
    3 computers (XP,Vista and 7)

    Everything has static IPs with the exception of 3 devices which you have no
    control over.

    Any help would be greatly appreciated, Thanks,
    Carl
     
    Iced Tea, Sep 11, 2012
    #1
    1. Advertisements

  2. Iced Tea

    Char Jackson Guest

    Nothing jumps out at me, with the possible exception of an IP
    addressing conflict (perhaps with one of the devices which you have no
    control over) since everything is static, so I would use a systematic
    approach. When Internet connectivity is lost, you've already verified
    that the LAN isn't affected by pinging or accessing in both
    directions, so (from the XP PC) ping the router's IP to make sure it's
    reachable, then ping your ISP's gateway IP and/or an Internet address
    such as 4.2.2.2 or 8.8.8.8, two easy to remember IPs. It would be nice
    to know where connectivity is breaking down.

    You could also disconnect everything from the WRT54GL (during the
    affected period) and connect the XP PC directly to the router,
    bypassing the Zonet hub (switch?). The point is to rule things out and
    narrow down the possible culprits. Disconnecting everything else rules
    out conflicts from those systems/devices, while connecting directly to
    the router rules out the hub. Pinging various endpoints verifies basic
    connectivity without relying on Layer 7 applications such as web
    browsers. I assume you've already considered whether the XP PC is
    scheduled to run a task every day that's causing this behavior.
     
    Char Jackson, Sep 11, 2012
    #2
    1. Advertisements

  3. Iced Tea

    Iced Tea Guest

    I have discovered something sort of new this morning, I turned the computer
    on later than I usually do and it seems like it is 30-35 minutes after I
    turn on the XP PC that I lose the connection for about 10 minutes.

    I did ping the router ip and my ISP gateway and had 0% loss, as far as the
    XP PC running some sort of task that would shut the connection down, there
    is nothing that I am aware of.

    I have bypassed the hub/switch but I figured since I didn't have any signal
    loss that it was either one of those devices. I am wrong to think that?
    Remember I am not a network guru just know the very basics.
     
    Iced Tea, Sep 13, 2012
    #3
  4. Iced Tea

    Char Jackson Guest

    I suppose that points to something on that particular PC, versus
    something elsewhere on the network, like the router.
    If that test was performed during the period of lost connectivity, it
    indicates that connectivity is not actually lost. That brings up the
    obvious question: how are you determining that you're losing Internet
    connectivity for a period of time? Let me expand that question: What
    are ALL OF THE WAYS that you're determining that you're losing
    Internet connectivity for a period of time?
     
    Char Jackson, Sep 13, 2012
    #4
  5. Iced Tea

    Iced Tea Guest

    Yes I did perform those tests when I lost connectivity. The only way I know
    that I lose the connection is that I am usually surfing the web or checking
    my email with IE 8, Microsoft Office Outlook 2003 and Outlook Express 6. I
    start getting 'Web page cannot be displayed' or 'News server cannot be
    found' or the error when Outlook tries to send/receive email.

    Not sure what else to check.

    Thanks for your help so far,
    Carl
     
    Iced Tea, Sep 14, 2012
    #5
  6. Iced Tea

    Char Jackson Guest

    The good news seems to be that it's not a network or connectivity
    issue. It looks like a DNS issue, possibly caused by malware. Which
    antimalware tools do you regularly use?

    You can easily check if it's limited to DNS by gathering the IP
    address(es) of one or more popular web sites and/or your email servers
    before you're experiencing the problem. Then, when you can't access
    the website or mail server by it's usual URL, try to use its IP
    address instead. If the site loads, something is stepping on your
    DNS...possibly malware trying to intercept your DNS requests and
    redirecting them.

    Examples:
    www.google.com
    74.125.225.208
    www.yahoo.com
    98.139.183.24 (Yahoo page saying page not found, but redirects
    automatically)
    www.microsoft.com
    65.55.57.27
     
    Char Jackson, Sep 14, 2012
    #6
  7. Iced Tea

    Iced Tea Guest

    I have the AVG Internet Security Suite (paid subscription) and I us the free
    version of Spybot. Definitions on both are up to date and neither one find
    anything, if you have another malware finder to reccomend please let me
    know. You help has and is very much appreciated.

    Thanks!!!
    Carl
     
    Iced Tea, Sep 15, 2012
    #7
  8. Iced Tea

    Char Jackson Guest

    I use Malwarebytes Antimalware (MBAM) and SuperAntiSpyware, both free.
    No real idea if they are better, but different tools sometimes find
    things missed by others.

    Were you able to test the DNS bypass that I suggested earlier?
     
    Char Jackson, Sep 16, 2012
    #8
  9. Iced Tea

    Iced Tea Guest

    Not yet on the DNS bypass, will let you know

     
    Iced Tea, Sep 17, 2012
    #9
  10. Iced Tea

    micheal53

    Joined:
    Oct 5, 2012
    Messages:
    2
    Likes Received:
    0
    Network issues?
    I have a network setup with a server running windows 2000, for some reason my clients cant get to the internet. They all have 192 addresses and all can ping the server, as well as the server can ping them, but for some reason I cant get the clients on the internet and out printer connection has also gone down, does anyone have any suggestions. Almost forgot to mention, can get onto the internet from the server


    I have DHCP assigning ip addresses. After looking at each workstation I see that the router and one workstation have the same ip address. So I changed the ip address
     
    micheal53, Oct 5, 2012
    #10
  11. You can also check if AVG is running some kind of a scan or firewall to
    drop http packets. you can verify by doing a ping to www.yahoo.com, if
    the ip is resolved DNS works and so there could be a problem that http
    is not working.

    Thanks,
    Vinodh
     
    Vinodh Kumar VS, Feb 25, 2013
    #11
  12. Iced Tea

    bangaloredatacom

    Joined:
    Feb 22, 2013
    Messages:
    6
    Likes Received:
    0
    Location:
    bangalore
    Network or router connection issue card not connected properly.
    Bad network card drivers or software settings.
    Firewall preventing computers from seeing each other.
    Connection related issues.
    Bad network hardware.
     
    bangaloredatacom, May 29, 2013
    #12
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.