Jan 032009
 

IPv6 is enebled by default in Windows Server 2008. If you are not using IPv6 then this can be disabled from the Windows Registry as follows:

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Nov 042008
 

Windows Server 2008/2003, Windows Vista, Windows XP and Windows 2000 by default will respond to ARP requests only if the Ethernet address in an ARP request is unicast. The system will not respond if the incoming ARP request did not have a unicast source ethernet address.
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Oct 282008
 

By default IPv4 packets are encapsulated on Ethernet  subnets in Ethernet II or Ethernet DIX format in Windows server 2008/2003, Windows Vista/XP/2000. However, if you need to use IEEE 802.3 SNAP (Sub-Network Acces Protocol) then this can be done from Windows Registry.

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Oct 252008
 

Networked Computers can send ICMP Type 17 messages to know the subnet mask of the local network. Only hosts configured to be routers or gateways can respond to these messages. By default Windows hosts do not respond to ICMP Type 17 (Address request) messages as restriced by RFC 1122.

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Oct 152008
 

TCP protocol can offload some of the tasks that are being processed by the system processor like Checksum calculation on header and data or IPSec Tunnel Encryptio (if supported by the NIC) onto the Network Interface Card (NIC). Task offloading is designed to improve performance and it is seen to have indeed significantly improve performance.

Windows Server 2008/2003, Windows Vista/XP by defines enables support Task Offloading. However, there may be instance where you need to troubleshoot network performance issues and need to disable the Task offloading. This can be done from the Windows Registry

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