Oct 142008
 

By default all the supported features for IPv6 are enabled in Windows Vista and Windows Server 2008. However, if you are not using IPv6 yet then you don't need to be enabled at all or if you do use and want some of the components be disabled because you don't use it then this can be done Windows Registry.

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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 282008
 

IP Soure routing is an option which allows the source of a packet to specify the path that the packet will take, and what path return packets sent back to the source will take. Source routing is useful when the default route that a connection will take fails or is suboptimal for some reason, or for network diagnostic purposes. However, even more is a menace as poses a severe security issue where malicous users can exploit this feature to cause DoS attacks or even bypass LAN security rules in place.

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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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Sep 112008
 

Path maximum transmission unit (PMTU) discovery is the process of discovering the maximum size of packet that can be sent across the network between two hosts without fragmentation (that is, without the packet being broken into multiple frames during transmission). By discovering the path MTU (PMTU) and limiting TCP segments to this size, TCP can eliminate fragmentation at routers along the path that connects networks with different MTUs. Fragmentation adversely affects TCP throughput and network congestion.

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