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Cannot Communicate with Primary DNS Server

Discussion in 'Networking' started by Ikthale, Mar 22, 2010.

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  1. Ikthale

    Ikthale Thread Starter

    Joined:
    Mar 22, 2010
    Messages:
    2
    Hey guys, I've been having this problem for a little while now, and I haven't been able to find a solution.

    I'll be randomly browsing the internet, or playing a game online, and the send light on my modem (it's a Motorola SB5100 Surfboard) will start blinking slowly and only a few times, then it will go solid again. However, my internet will drop, and it acts as if my internet is completely disconnected. I'll run diagnose and repair, and it says "Cannot Communicate With Primary DNS Server". This happens at random times throughout the day and can happen multiple times consecutively, or it might not happen all day or just once a day. It confuses me.

    I've tried a lot of things to fix it, I've searched the internet all over for a solution, but nothing works. I called my ISP, and the guy over the phone couldn't find anything wrong, so they sent someone out and he couldn't find anything wrong, and actually said the modem has a strong signal. Well behold as soon as the guy leaves it happens.

    Here is my ipconfig info when my internet is working

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : Ikthale-PC
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : ks.cox.net

    Ethernet adapter Local Area Connection 2:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Realtek RTL8168D/8111D Family PCI Gigabit
    Ethernet NIC (NDIS 6.0)
    Physical Address. . . . . . . . . : 00-24-1D-15-33-38
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : ks.cox.net
    Description . . . . . . . . . . . : Realtek RTL8168D/8111D Family PCI Gigabit
    Ethernet NIC (NDIS 6.0)
    Physical Address. . . . . . . . . : 00-24-1D-15-33-36
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::3803:ddba:b931:5c8f%10(Preferred)
    IPv4 Address. . . . . . . . . . . : 68.102.88.63(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.224.0
    Lease Obtained. . . . . . . . . . : Monday, March 22, 2010 6:24:25 PM
    Lease Expires . . . . . . . . . . : Tuesday, March 23, 2010 6:24:25 PM
    Default Gateway . . . . . . . . . : 68.102.64.1
    DHCP Server . . . . . . . . . . . : 172.19.121.13
    DHCPv6 IAID . . . . . . . . . . . : 167781405
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-11-68-E4-27-00-24-1D-15-33-36

    DNS Servers . . . . . . . . . . . : 68.105.28.11
    68.105.29.11
    68.105.28.12
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter Local Area Connection* 6:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : isatap.ks.cox.net
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    Tunnel adapter Local Area Connection* 11:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
    Physical Address. . . . . . . . . : 02-00-54-55-4E-01
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    Any help is appreciated!
     
  2. JohnWill

    JohnWill Retired Moderator

    Joined:
    Oct 19, 2002
    Messages:
    106,418
    Classic sign of an ISP issue. The disconnect is nothing you're doing, it's the modem, wiring, or the ISP.

    Check the cable to the modem and make sure you're not getting power interruptions. Most of the time, this is an ISP issue.



    Register at DSLReports and run their Line Quality Tests. It's best to run this test with a direct wired connection to eliminate any wireless issues from the results. It's useful many times to run this test several times, and we'd like to see each of the results. Post the results link from the top of the test display page for each test run here.

    The link to post is near the top of the page and looks like:

    If you wish to post this result to a forum, please copy/paste this URL
    http://www.dslreports.com/linequality/nil/2357195 <- sample only, yours will obviously be different!
    and your IP will be disguised.

    Copy/paste that link here.

    Note: You will have to enable PING (ICMP) request response either in your router (if you have one), or in your computer's firewall for direct modem connections. This is very important to get the most important part of the test to run.


    DSLReports

    Here's also the Line Quality Tests FAQ to help you understand the results. This will answer some questions about the line quality display.
     
  3. Ikthale

    Ikthale Thread Starter

    Joined:
    Mar 22, 2010
    Messages:
    2
  4. JohnWill

    JohnWill Retired Moderator

    Joined:
    Oct 19, 2002
    Messages:
    106,418
    Well, it's either the modem or the ISP. I'd call the ISP and complain, they really can't ignore the issue of the connection dropping.
     
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