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Cannot Communicate with primary DNS server

Discussion in 'Networking' started by greenberry456, May 15, 2010.

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  1. greenberry456

    greenberry456 Thread Starter

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    My internet always gives me this when I try to repair the it. After awhile, it comes on again for a little bit and then dies out again. Even when my internet is working fine, it has considerably slowed down to a few months ago.
     
  2. JohnWill

    JohnWill Retired Moderator

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    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. greenberry456

    greenberry456 Thread Starter

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    I get this : "sorry, xx.xxx.xx.xxx is not pingable from www.dslreports.com."
     
  4. JohnWill

    JohnWill Retired Moderator

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    What's the make/model of the modem and router?
     
  5. greenberry456

    greenberry456 Thread Starter

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    I'm a real noobie when it comes to tech. stuff. How do i find out the model ?
     
  6. JohnWill

    JohnWill Retired Moderator

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    Look at the label on the bottom of the device.
     
  7. greenberry456

    greenberry456 Thread Starter

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    Model : SB5101
     
  8. JohnWill

    JohnWill Retired Moderator

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    You need to disable your firewall in the computer for the test. I'm assuming you don't have a router since you didn't mention one?
     
  9. greenberry456

    greenberry456 Thread Starter

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    The router model is WRT54G ver. 6 sorry. Also my Windows Firewall and Norton Firewall are both turned off.
     
  10. JohnWill

    JohnWill Retired Moderator

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    OK, connect directly to the modem (power cycle the modem to make the change), and then run the test.
     
  11. greenberry456

    greenberry456 Thread Starter

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    How do I do that?
     
  12. JohnWill

    JohnWill Retired Moderator

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    Turn off the modem, connect your computer to the modem with a plain Ethernet cable. Turn on the modem, reboot your computer.
     
  13. greenberry456

    greenberry456 Thread Starter

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    Still doesn't work. Not pingable still.
     
  14. JohnWill

    JohnWill Retired Moderator

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    Try these simple tests.

    Hold the Windows key and press R, then type CMD (COMMAND for W98/WME) to open a command prompt:

    In the command prompt window that opens, type type the following commands one at a time, followed by the Enter key:

    NOTE: For the items below in red surrounded with < >, see comments below for the actual information content, they are value substitutions from the previous IPCONFIG command output! Do NOT type <computer_IP_address> into the command, that won't work. Also, the < and > in the text is to identify the parameters, they are also NOT used in the actual commands.

    Do NOT include the <> either, they're just to identify the values for substitution.

    IPCONFIG /ALL

    PING <computer_IP_address>

    PING <default_gateway_address>

    PING <dns_servers>

    PING 74.125.45.100

    PING yahoo.com

    Right click in the command window and choose Select All, then hit Enter to copy the contents to the clipboard.
    Paste the results in a message here.

    <computer_IP_address> - The IP Address of your computer, obtained from the IPCONFIG command above. (For Vista/Win7, the IPv4 Address)

    <default_gateway_address> - The IP address of the Default Gateway, obtained from the IPCONFIG command above.

    <dns_servers> - The IP address of the first (or only) address for DNS Servers, obtained from the IPCONFIG command above.


    If you are on a machine with no network connection, use a floppy, USB disk, or a CD-RW disk to transfer a text file with the information to allow pasting it here.
     
  15. greenberry456

    greenberry456 Thread Starter

    Joined:
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    Microsoft Windows [Version 6.0.6002]
    Copyright (c) 2006 Microsoft Corporation. All rights reserved.

    C:\Users\thanh>ipconfig /all

    Windows IP Configuration

    Host Name . . . . . . . . . . . . : thanh-PC
    Primary Dns Suffix . . . . . . . :
    Node Type . . . . . . . . . . . . : Hybrid
    IP Routing Enabled. . . . . . . . : No
    WINS Proxy Enabled. . . . . . . . : No
    DNS Suffix Search List. . . . . . : hsd1.ca.comcast.net.

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : hsd1.ca.comcast.net.
    Description . . . . . . . . . . . : NVIDIA nForce 10/100 Mbps Ethernet
    Physical Address. . . . . . . . . : 00-1F-C6-39-83-16
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::c9fd:af49:372a:b6d6%10(Preferred)
    IPv4 Address. . . . . . . . . . . : 192.168.1.100(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Monday, May 31, 2010 11:53:48 AM
    Lease Expires . . . . . . . . . . : Tuesday, June 01, 2010 11:53:48 AM
    Default Gateway . . . . . . . . . : 192.168.1.1
    DHCP Server . . . . . . . . . . . : 192.168.1.1
    DHCPv6 IAID . . . . . . . . . . . : 251666060
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-13-55-BC-19-00-1F-C6-39-83-16

    DNS Servers . . . . . . . . . . . : 68.87.76.182
    68.87.78.134
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Tunnel adapter Local Area Connection* 6:

    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

    Tunnel adapter Local Area Connection* 11:

    Media State . . . . . . . . . . . : Media disconnected
    Connection-specific DNS Suffix . : hsd1.ca.comcast.net.
    Description . . . . . . . . . . . : isatap.hsd1.ca.comcast.net.
    Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes

    C:\Users\thanh>ping 192.168.1.100

    Pinging 192.168.1.100 with 32 bytes of data:
    Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
    Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
    Reply from 192.168.1.100: bytes=32 time<1ms TTL=128
    Reply from 192.168.1.100: bytes=32 time<1ms TTL=128

    Ping statistics for 192.168.1.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 0ms, Maximum = 0ms, Average = 0ms

    C:\Users\thanh>ping 192.168.1.1

    Pinging 192.168.1.1 with 32 bytes of data:
    Reply from 192.168.1.1: bytes=32 time=2ms TTL=64
    Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
    Reply from 192.168.1.1: bytes=32 time=1ms TTL=64
    Reply from 192.168.1.1: bytes=32 time=1ms TTL=64

    Ping statistics for 192.168.1.1:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 1ms, Maximum = 2ms, Average = 1ms

    C:\Users\thanh>ping 68.87.76.182

    Pinging 68.87.76.182 with 32 bytes of data:
    Reply from 68.87.76.182: bytes=32 time=18ms TTL=113
    Reply from 68.87.76.182: bytes=32 time=18ms TTL=113
    Reply from 68.87.76.182: bytes=32 time=27ms TTL=113
    Reply from 68.87.76.182: bytes=32 time=17ms TTL=113

    Ping statistics for 68.87.76.182:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 17ms, Maximum = 27ms, Average = 20ms

    C:\Users\thanh>ping 68.87.78.134

    Pinging 68.87.78.134 with 32 bytes of data:
    Reply from 68.87.78.134: bytes=32 time=62ms TTL=105
    Reply from 68.87.78.134: bytes=32 time=63ms TTL=105
    Reply from 68.87.78.134: bytes=32 time=52ms TTL=105
    Reply from 68.87.78.134: bytes=32 time=52ms TTL=105

    Ping statistics for 68.87.78.134:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 52ms, Maximum = 63ms, Average = 57ms

    C:\Users\thanh>ping 74.125.45.100

    Pinging 74.125.45.100 with 32 bytes of data:
    Reply from 74.125.45.100: bytes=32 time=78ms TTL=51
    Reply from 74.125.45.100: bytes=32 time=78ms TTL=51
    Reply from 74.125.45.100: bytes=32 time=89ms TTL=51
    Reply from 74.125.45.100: bytes=32 time=101ms TTL=51

    Ping statistics for 74.125.45.100:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 78ms, Maximum = 101ms, Average = 86ms

    C:\Users\thanh>ping yahoo.com

    Pinging yahoo.com [209.191.122.70] with 32 bytes of data:
    Reply from 209.191.122.70: bytes=32 time=65ms TTL=50
    Reply from 209.191.122.70: bytes=32 time=62ms TTL=50
    Reply from 209.191.122.70: bytes=32 time=62ms TTL=50
    Reply from 209.191.122.70: bytes=32 time=62ms TTL=50

    Ping statistics for 209.191.122.70:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
    Approximate round trip times in milli-seconds:
    Minimum = 62ms, Maximum = 65ms, Average = 62ms

    C:\Users\thanh>
     
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