May 222011
 

Turn your PC or Laptop into a Wireless hotspot with Virtual Router. Virtual Router is a free opensource software that lets you convert your Windows 7 or Windows Server 2008 R2 server into a Virtual wireless router or a hotspot by using

the built-in Virtual Wifi and Wireless Hosted Network features of Windows 7 and Windows Server 2008 R2.

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May 102010
 

Microsoft has a free Internet Connectivity evaluation tool that you can use to test your internet connectivity status and what features apart from the basic connectiviy that your router which connects you to Internet provides.

This is quite useful tool and unfortunately only on Internet Explorer browser. It installs as a browser addon and runs from the browser so no installation is required.

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Feb 132009
 

Sometimes your Windows Vista will fail to obtain an IP Address from a DHCP server like your Broadband or Wireless router. This is due to a design change in Windows Vista. Unlike in Windows XP (and in the later Windows 7 Beta), Windows Vista DHCP Discovery packets have Broadcast flag enabed by default. This means some of the routers or devices acting as a DHCP server which doesn't support Broadcast flag set in incoming DHCP discovery packetsmay fail to serve the Windows Vista machine with an IP Address.

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Oct 062008
 

Have you ever wondered where the network configuration settings like IP Address Subnet mask or the same settings provided by your DHCP server (propably your home broadband router) on a network interface or a wireless interface are stored on your computer?

Undoubtedly, these are stored in the Windows registry. While there is no need to change any of these values from Windows Registry as it is good enough to make the changes network settings, it is still good enough to where they are and what the related registry keys are.

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Sep 172008
 

A few days ago, we saw how to Enable/Disable Path MTU Discovery (PMTU Discovery) from the registry. Now, we shall go further and see how to Enable or Disable Path MTU Blackhole router detection in Windows 2008/Vista/2003/XP/2000 from Windows Registry. Path MTU Blackhole router detection is enabled by default so as the Path MTU Discovery.

A PMTU black hole router is a routing device which does not return ICMP Destination Unreachable messages when it needs to fragment an IPv4 packet that has the Don’t Fragment (DF) flag set. TCP depends on receiving these messages to perform PMTU discovery. With this feature enabled, TCP tries to send segments without the Don’t Fragment flag set if several retransmissions of a segment go unacknowledged. If the segment is then acknowledged, the TCP maximum segment size (MSS) for the connection is decreased and the Don’t Fragment flag is set for subsequent segments. Enabling PMTU black hole detection increases the maximum number of retransmissions that are performed for a given segment.

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