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DNS Server Isn't Responding, Modem works, not router


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#1 mdw90

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Posted 08 February 2015 - 10:39 AM

For some reason I can't get the router to work I get a dns server isn't responding issue when plugging the ethernet into the router.  The internet works when I plug the ethernet into the modem.  Here are the ipconfig logs of both.

 

Modem (works):

 

Microsoft Windows [Version 6.1.7601]
Copyright © 2009 Microsoft Corporation.  All rights reserved.
 
C:\Users\Marc>ipconfig /all
 
Windows IP Configuration
 
   Host Name . . . . . . . . . . . . : Marc-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : hsd1.ct.comcast.net.
 
Wireless LAN adapter Wireless Network Connection 2:
 
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : TP-LINK 450Mbps Wireless N Adapter
   Physical Address. . . . . . . . . : 10-FE-ED-25-11-57
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
 
Ethernet adapter Local Area Connection:
 
   Connection-specific DNS Suffix  . : hsd1.ct.comcast.net.
   Description . . . . . . . . . . . : Intel® Ethernet Connection I217-V
   Physical Address. . . . . . . . . : 74-D4-35-17-6F-89
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 73.167.182.128(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Lease Obtained. . . . . . . . . . : Sunday, February 08, 2015 10:31:18 AM
   Lease Expires . . . . . . . . . . : Sunday, February 08, 2015 11:21:38 AM
   Default Gateway . . . . . . . . . : 73.167.182.1
   DHCP Server . . . . . . . . . . . : 69.252.65.133
   DNS Servers . . . . . . . . . . . : 75.75.75.75
                                       75.75.76.76
   NetBIOS over Tcpip. . . . . . . . : Enabled
 

 

C:\Users\Marc>
 
Router (Doesn't work through ethernet):
 
Microsoft Windows [Version 6.1.7601]
Copyright © 2009 Microsoft Corporation.  All rights reserved.
 
C:\Users\Marc>ipconfig /all
 
Windows IP Configuration
 
   Host Name . . . . . . . . . . . . : Marc-PC
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
 
Wireless LAN adapter Wireless Network Connection 2:
 
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : TP-LINK 450Mbps Wireless N Adapter
   Physical Address. . . . . . . . . : 10-FE-ED-25-11-57
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
 
Ethernet adapter Local Area Connection:
 
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel® Ethernet Connection I217-V
   Physical Address. . . . . . . . . : 74-D4-35-17-6F-89
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.1.8(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : Sunday, February 08, 2015 10:32:30 AM
   Lease Expires . . . . . . . . . . : Monday, February 09, 2015 10:32:30 AM
   Default Gateway . . . . . . . . . : 192.168.1.1
   DHCP Server . . . . . . . . . . . : 192.168.1.1
   DNS Servers . . . . . . . . . . . : 192.168.1.1
   NetBIOS over Tcpip. . . . . . . . : Enabled
 
C:\Users\Marc>

 



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#2 mdw90

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Posted 08 February 2015 - 11:04 AM

Did this fix from the DNS lookup failed thread and it works thanks to cave.

 

 

Click windows button --- type cmd --- on the shortcut, right click and Run as Admin -- type ipconfig /flushdns press enter

 

click windows button --- Control panel --- under Network and Internet click View network status and tasks -- upper left click change adapter settings -- right click on your connection, Local area connection is if you're wired, Wireless Network Connection if wireless --- click Properties -- click to highlight Internet Protocol Version 4 --- click Properties button -- click Use the following DNS server addresses and in the boxes type 208.67.222.222 as Preferred and 208.67.220.220 as Alternate -- click OK, Close and close network connections -- reboot your computer and try it.

 

Those 2 things flushed all DNS entries in your DNS cache and then we changed the default DNS servers to OpenDNS servers, some of the best out there. Report back what happens for you.

 
I had tried ipconfig /flushdns but not the other part. :)

Edited by mdw90, 08 February 2015 - 11:04 AM.


#3 Kilroy

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Posted 08 February 2015 - 11:27 AM

1.  Power down the modem and the router.

2.  Disconnect all devices from the modem.

3.  Turn on the modem.

4.  Connect the router to the modem and turn on the router.

5.  Connect devices to the router and power up.

 

The issue is that Comcast only gives you one IP address and the modem remembers the last device connected to it and will not work with anything else until you perform the steps above.






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