Tweeted twitter.com/#!/super_user/status/599524471121289216

occurred May 16, 2015 at 10:39

added the most obvious symptom of this problem: that nslook is working while ping -4 name.com is not

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edited May 8, 2015 at 3:17

john v kumpf

785
1
8
19

Windows 7 DNS not working (nslookup IS working; ping -4 name.com NOT working)

nslookup IS working; ping -4 name.com NOT working#

The most obvious symptom of this problem is that nslookup IS working, while ping -4 name.com is NOT working.

That's because nslookup contains its own DNS client, and so does not use the Windows one.

ping when given a name, uses the Windows DNS Client to translate name -> number.

So if nslookup can translate, then lots of things work: networking hardware, NIC adapter driver, internet connectivity to the DNS servers, and successfully accessing the servers to do a translation. That's a lot!

However, ping -4 name.com fails, so if all that other stuff is working, it's the Windows DNS client software itself that is implicated.

Note i did ping -4 to isolate to IPv4 excluding IPv6 influences.

Best wayThat's why the best symptom to describe the actual problem is that

Windows 7 DNS not working

Best way to describe the problem is that

Windows 7 DNS not working (nslookup IS working; ping -4 name.com NOT working)

nslookup IS working; ping -4 name.com NOT working#

The most obvious symptom of this problem is that nslookup IS working, while ping -4 name.com is NOT working.

That's because nslookup contains its own DNS client, and so does not use the Windows one.

ping when given a name, uses the Windows DNS Client to translate name -> number.

So if nslookup can translate, then lots of things work: networking hardware, NIC adapter driver, internet connectivity to the DNS servers, and successfully accessing the servers to do a translation. That's a lot!

However, ping -4 name.com fails, so if all that other stuff is working, it's the Windows DNS client software itself that is implicated.

Note i did ping -4 to isolate to IPv4 excluding IPv6 influences.

That's why the best symptom to describe the actual problem is that

typo

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edited May 8, 2015 at 2:38

john v kumpf

785
1
8
19

C:\Users\[username]>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . :       <<<====NOTE NO HOST NAME
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : ed*****.***l.edu

Wireless LAN adapter Wireless Network Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : ed*****.***l.edu
   Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 10.131.2.**(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.128.0
   Lease Obtained. . . . . . . . . . : Monday, April 27, 2015 11:32:13 AM
   Lease Expires . . . . . . . . . . : Monday, April 27, 2015 11:47:13 AM
   Default Gateway . . . . . . . . . : 10.131.0.1
   DHCP Server . . . . . . . . . . . : 132.236.56.249
   DNS Servers . . . . . . . . . . . : 192.35.82.50
                                       128.253.180.2
                                       132.236.56.250
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : r****.****l.edu
   Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Reusable ISATAP Interface {CBE4B55D-63C6-460A-82CF-7076427CD2AF}:


   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.e****.****l.edu:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 9:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{270C639B-82A2-4AE7-B886-D40DAA7EF798}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.r****.****l.edu:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

C:\Users\[username]>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . :
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : ed*****.***l.edu

Wireless LAN adapter Wireless Network Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : ed*****.***l.edu
   Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 10.131.2.**(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.128.0
   Lease Obtained. . . . . . . . . . : Monday, April 27, 2015 11:32:13 AM
   Lease Expires . . . . . . . . . . : Monday, April 27, 2015 11:47:13 AM
   Default Gateway . . . . . . . . . : 10.131.0.1
   DHCP Server . . . . . . . . . . . : 132.236.56.249
   DNS Servers . . . . . . . . . . . : 192.35.82.50
                                       128.253.180.2
                                       132.236.56.250
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : r****.****l.edu
   Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Reusable ISATAP Interface {CBE4B55D-63C6-460A-82CF-7076427CD2AF}:


   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.e****.****l.edu:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 9:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{270C639B-82A2-4AE7-B886-D40DAA7EF798}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.r****.****l.edu:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

C:\Users\[username]>ipconfig /all

Windows IP Configuration

   Host Name . . . . . . . . . . . . :       <<<====NOTE NO HOST NAME
   Primary Dns Suffix  . . . . . . . :
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : ed*****.***l.edu

Wireless LAN adapter Wireless Network Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft Virtual WiFi Miniport Adapter
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . : ed*****.***l.edu
   Description . . . . . . . . . . . : Broadcom 802.11n Network Adapter
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 10.131.2.**(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.128.0
   Lease Obtained. . . . . . . . . . : Monday, April 27, 2015 11:32:13 AM
   Lease Expires . . . . . . . . . . : Monday, April 27, 2015 11:47:13 AM
   Default Gateway . . . . . . . . . : 10.131.0.1
   DHCP Server . . . . . . . . . . . : 132.236.56.249
   DNS Servers . . . . . . . . . . . : 192.35.82.50
                                       128.253.180.2
                                       132.236.56.250
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : r****.****l.edu
   Description . . . . . . . . . . . : Broadcom NetLink (TM) Gigabit Ethernet
   Physical Address. . . . . . . . . : xx-xx-xx-xx-xx-xx
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Reusable ISATAP Interface {CBE4B55D-63C6-460A-82CF-7076427CD2AF}:


   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.e****.****l.edu:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 9:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{270C639B-82A2-4AE7-B886-D40DAA7EF798}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #4
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.r****.****l.edu:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #5
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

added additional rootkit scanners we've run

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edited May 5, 2015 at 18:36

john v kumpf

785
1
8
19

The only thing we'veWe've run for rootkit is Malwarebytes Anti-Malware, also their Malwarebytes Anti-Rootkit beta, TDSSKiller, and Comodo Cleaning Essentials (CCE, but it appears not to be updated).

added 2 more things we tried

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edited Apr 30, 2015 at 21:30

john v kumpf

785
1
8
19

Loading

added 4329 characters in body

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edited Apr 27, 2015 at 20:07

john v kumpf

785
1
8
19

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asked Apr 27, 2015 at 6:59

john v kumpf

785
1
8
19

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Windows 7 DNS not working (nslookup IS working; ping -4 name.com NOT working)

nslookup IS working; ping -4 name.com NOT working#

Windows 7 DNS not working

Windows 7 DNS not working (nslookup IS working; ping -4 name.com NOT working)

nslookup IS working; ping -4 name.com NOT working#