Posts Tagged ‘wireless router’

Fix temporary DNS problems on Windows – ipconfig /flushdns

Monday, March 17th, 2014

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.

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:\Users\hipo> 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. . . . . . . . . . . :
   Subnet Mask . . . . . . . . . . . :
   Lease Obtained. . . . . . . . . . : March 17, 2014 16:57:40 PM
   Lease Expires . . . . . . . . . . : March 18, 2014 16:57:40 PM
   Default Gateway . . . . . . . . . :
   DHCP Server . . . . . . . . . . . :
   DHCPv6 IAID . . . . . . . . . . . : 1094494708
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-CB-1A-5D-A4-5D-36-5A-EB-84

   DNS Servers . . . . . . . . . . . :

   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:\Users\hipo> 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

Fixing Compaq Presario CQ71-330ED can’t connect to wireless on 64-bit Windows 7

Thursday, January 10th, 2013

Fixing Windows 7 Wireless Compaq Presario CQ71 330ED notebook  / What makes it not to connect to wi-fi

I had to fix one Notebook Compaq CQ71-330ED which was failing connecting to a home Wireless Router. The notebook was running 64 Bit Windows 7 installed from scratch just few weeks ago. The PC could connect normally via a LAN cable to the Internet, but can't connect to the Wireless Router. I thought the issue might be due to the Wireless Router, thus checked with my laptop if I can connect to the WPA2 network with the pass key. Being able to connect from my own PC make it clear the problem is somewhere in Windows 7 (most likely the drivers). I checked in

Control Panel -> Device Manager


to make sure the Wireless drivers were appearing as properly installed, there all seemed fine, Wireless was detected as:

Intel (R) Centrino Wireless-N 1000

I tried playing with Wireless settings from

Control Panel -> Network and Internet

stopped Wireless Power Saving, as I know with some wireless devices it creates problems. Also tried settings the default wireless network support from A B G N to A B G. I tried playing with changing the Workgroup name to WORKGROUP., Disabling / Enabling the Wireless Network, checking if settings for IP obtain for IPv4 are not messed up etc., but all seemed okay and still the PC weirdly was unable to connect to Wi-fi network.

I suspected, the drivers though reporting as properly installed and working with the Wi-Fi card are the point of failure. So removed driver for Wireless card and tried re-installing.

As the model of laptop was COMPAQ Presario CQ71-330ED, I looked for this model driver, but again strangely CQ71-330ED was not among the Presario models on drivers section.

I improvised and dfecided to download 64 bit Wi-Fi drivers for the model which seemed to be closest to CQ71-330ED – Compaq Presario CQ71-120ED.

Install the Intel 64-bit Wireless Driver for notebook CQ71-120ED solved the Wi-Fi Router connection issues. Re-connecting once again to the WPA network just worked 🙂

A mirror of Wireless driver that worked for me . After installing the driver the Wireless was detected as:

Intel (R) Wifi Link BGN



Cleaning Packard Bell Hera GL laptop running Windows XP from Viruses and Spyware (Viruses / Spyware which can make CD drive and Wireless seem unworking)

Tuesday, December 13th, 2011

Packard Bell Hera GL Fixing Broken RaLink Wireless

Yesterday, one (girl)friend of mine brought me one Packard Bell notebook, which had a 2 years old Windows installed on it.
As one can imagine Windows XP on it is full of Spyware and Viruses. Besides the software problems the notebook had some hardware problems with the CD / DVD which is not reading CD / DVDs at all.

Initially I thought, the CD unable to read problems are caused by the infected Windows, however even restarting the PC with a bootable Hirens BootCD and a Whoppix liveCD and trying to boot from it failed this convinced me its a CD / DVD combo drive hardware failure.

By the way, I’ve just recently found out about Nixory – Is a nice Free Software Open Source AntiSpyware tool for Firefox, IE and Chrome.

Nixory Windows XP Screenshot

I hope it will get a sharp development and soon, when some friend asks me to fix his stupid non free-Windows PC, I would not have to use a trial version of Malware Bytes but directly use only Nixory

Anyways after using Nixory, MalwareBytes and Avira and thoroughfully scanned the system in Safe Mode and found and deleted some 15 Spyware / Viruses and tampered a bit with the Wireless Driver settings all the notebook devices started working fine again.

The wireless had also one really odd problem on this Packard BellHera GL, even though the notebook wireless antenna was capable of detecting all the wireless networks it couldn’t properly connect to any of it but failed to get proper IP addresses.
Partially the unable to grab an IP via wireless router dhcp server got fixed by using the Wireless restart Button (located on the Notebook corpus).
However even after cleaning up the Virus and Spyware the Wireless Networks connectivity problems on this Packard Bell continued, until I changed also few settings in the Control PanelI never thought Viruses / Spyware infected can have some bad impact on Wireless Card and CD drive make them unsusable though they showed like working correctly in Windows Control Panel -> System ??

In the meantime I reinstalled the Wireless Driver for the notebook, the Wireless card on the notebook was showing up itself under the name of Ralink 802.11n Wireless Lan Card in Windows Device Manager

After re-installing the wireless driver I had to also change few settings for the Wireless Network Connection using the menus Properties -> Configure -> Extended; therein everywhere for each Value I make it be Enable and for Power Saving Mode , I’ve choose the Value option of CAM

After a system reboot, everything started working finally fine. One last thing to add is that before I fixed the Ralink wireless to work under Windows, I tried to use a Bootable Linux LiveCD but even there the wireless was failing to connect to the wireless networks (maybe this shit wireless device has some issues with its Linux drivers).

How to install Ubuntu Linux on Acer ASPIRE 5736Z Notebook / Get around the black screen install CD issue

Friday, July 1st, 2011

My sister’s newly bought laptop is Acer Aspire 5736Z . By the default this notebook comes with some kind of Linux distribution Linpus .
Even though this Linpus (crafted Linux especially for Acer notebooks) looked really nice, it prooved to be a piece of shit linux distro.
Linplus was unable to even establish a simple Wireless WPA2 protected connection with my wireless router, not to mention that the physical Linux consoles (CTRL+ALT+F1) were disabled …

This LinPlus was so bad that I couldn’t even launch any type of terminal on it (I was stuck!) so I decided to kill it and make a decent latest Ubuntu 11.04 Install on it.

I was surprised to find out that trying to boot up the Ubuntu 11.04 installer led me to a black screen (black screen of death).

The v Aspire’s 5736Z monitor kept completely blank, where the hard drive was continuously reading (indicating that the Ubuntu installer has properly booted but it couldn’t light up the notebook screen).

A bit of investigation on any issues with this Acer notebook model has led me to a thread in fedora forums:
On this forum the same kind of Linux install problem was described to also occur with ASPIREs 5736Z during a Fedora install.

I just tried the suggested fix and it works like a charm.

The fix goes like this:

1. Invoke the Ubuntu settings parameter Install pre install screen

Just press any button while the Ubuntu installer CD is reading and after few secs the Install options screen should appear, like you see it in below’s screenshot:

Ubuntu Install boot options parameters screen

2. Select the nomodetest Boot CD Ubuntu option

You see in the above screenshot the F6 Other Options . I had toto press F6 and choose the nomodetest boot option to make the Ubuntu be able to further boot up.

After selecting the nomodetest option and pressing on the Install Ubuntu menu option the graphic installer launched succesfully 😉
Hope this small tip to be helpful to some Ubuntu or other Linux user who is trying to install Linux on his Acer Aspire 5736Z
Cheers 😉