HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ interface-name

Data type


Default value


(Blank) | 0 | IP protocol numbers



Specifies the protocols that are accepted by the raw IP transport on this interface when security filtering is enabled. This entry is used only when the value of the EnableSecurityFilters entry is 1.

Protocols are identified by their protocol numbers. If the value of this entry contains valid protocol numbers, only IP datagrams using the specified protocols are accepted by the raw IP transport which provides raw sockets.

This entry determines which IP datagrams the raw IP transport accepts. It does not affect IP datagrams passed to other transports, such as TCP.



(Blank—the entry appears in the registry, but the value field contains no data)

No datagrams are accepted.

0 (or not in the registry)

All datagrams are accepted.

Specific IP protocol numbers

Only datagrams with these IP protocol numbers are accepted.

Change method

To change the value of this entry, use Network and Dial-up Connections. Right-click Local Area Connection, click Properties, click Internet Protocol (TCP/IP), and then click the Properties button. On the Internet Protocol (TCP/IP) Properties page, click the Advanced button, click the Options tab, click TCP/IP filtering, click Properties, and then, just above the IP Protocols box, click Permit Only. This entry is associated with the values added to the IP Protocols list on this page.

Note Image Note

There is no defined or predictable response when the value of this entry includes a zero together with IP protocol numbers. Do not combine these values in this entry.

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