Fix temporary DNS problems on Windows – ipconfig /flushdns

Monday, 17th March 2014

Reading Time: 2minutes

fix temporary dns issues ipconfig /fush
My internet connection is coming router over a strange Belarusian ADSL modem "Промсвязь". This device serves as ADSL modem and a Wireless Router.
promsviaz_belarusian_adsl_and_wifi_modem

Periodically I'm experiencing issues with DNS, where there is internet but DNS resolving stops woring even though in ipconfig /all I can see DNS settings are proper:

C:Usershipo> ipconfig /all

...
Wireless LAN adapter Wireless Network Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) Centrino(R) Ultimate-N 6300 AGN
   Physical Address. . . . . . . . . : 3C-A9-F4-4C-E7-98
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::5d2f:97b8:9e1a:2b13%63(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.100.2(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Lease Obtained. . . . . . . . . . : March 17, 2014 16:57:40 PM
   Lease Expires . . . . . . . . . . : March 18, 2014 16:57:40 PM
   Default Gateway . . . . . . . . . : 192.168.100.1
   DHCP Server . . . . . . . . . . . : 192.168.100.1
   DHCPv6 IAID . . . . . . . . . . . : 1094494708
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-CB-1A-5D-A4-5D-36-5A-EB-84

   DNS Servers . . . . . . . . . . . : 8.8.8.8
                                       192.168.100.1
                                       8.8.4.4

   NetBIOS over Tcpip. . . . . . . . : Enabled

 

The fix to situation is to Restart Promsvijazy and restart my Notebook. As this fix takes a lot of time I found another "work around". Make Windows Flush its DNS servers (forget old DNS servers and re-assign them again)

C:Usershipo> ipconfig /flushdns

Windows IP Configuration Successfully flushed the DNS Resolver Cache.


 

Other useful commands to make connection re-initiate completely are:

ipconfig /renew

Renews all Adapter settings (Lan, Wiki, PPP etc.) – re-assign IPs / re-initiate connections and

ipconfig /release

Releases any established connection

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7 Responses to “Fix temporary DNS problems on Windows – ipconfig /flushdns”

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    I forgot to mention problematic Промсвязь model isMT-PON-AT-4

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    By the way the questionable Promsvyaz is 2.5 half bigger than a normal wireless router 🙂 🙂 🙂

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