Data type


Default value


0x0–0xFFFFFFFF ( bytes, in 256-byte increments )

0x12200 ( 74,240 bytes )


Determines the size of the buffer that IP allocates for storing packet data in the router packet queue. Because packet queue data buffers are 256 bytes long, the value of this entry must be a multiple of 256.

The default value of 74,240 bytes is enough for 50 packets of 1480 bytes each, rounded to a multiple of 256.

When the buffer space is full, the router begins discarding packets at random from its queue. If packets are too large for the buffer, multiple buffers are chained together. If no buffers are allocated or if the IP router is not enabled, this entry is ignored.

Because packet headers are stored separately, buffer size is not affected by the IP header for a packet.

Note Image Note

Windows 2000 does not add this entry to the registry. You can add it by editing the registry or by using a program that edits the registry.

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