Registry Home > Network > Protocols > TCP-IP

Specify the Router Buffer Size (Windows NT/2000/XP)

This parameter determines how much memory IP allocates to store packet data in the router packet queue. When this buffer space is filled, the router begins discarding packets at random from its queue.

This tweak can be easily applied using WinGuides Tweak Manager.
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Open your registry and find or create the key below.

Create a new DWORD value, or modify the existing value, called "ForwardBufferMemory" and set it according to the value data below.

Exit your registry; you may need to restart or log out of Windows for the change to take effect.

Note: Packet queue data buffers are 256 bytes in length, so the value of this parameter should be a multiple of 256. Multiple buffers are chained together for larger packets. The IP header for a packet is stored separately. This parameter is ignored and no buffers are allocated if the IP router is not enabled.

Registry Editor Example
|(Default)REG_SZ(value not set)|
|ForwardBufferMemoryREG_DWORD0x00012200 (74240)|
Registry Settings
System Key: [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters]
Value Name: ForwardBufferMemory
Data Type: REG_DWORD (DWORD Value)
Value Data: 0 - 0xFFFFFFFF Buffer Size in Bytes

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Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.

Last modified: September 6, 2002