Data type


Default value


(Not in registry) | 0 | 1

(Not in registry)


Enables or disables source routing for IP broadcasts.

Some environments require source routing data, but some transparent bridges discard frames with source routing information when passing them to different media types, such as Ethernet. This entry lets you customize the setting of the source routing bit to suit your environment.



(Not in registry)

TCP/IP transmits Address Resolution Protocol (ARP) queries without source routing on the first attempt. If it does not receive a reply, it retransmits the query with source routing.


ARP queries and other IP broadcasts are never sent with source routing.


ARP queries are always sent with source routing.

Note Image Note

The implementation of this entry changed for Windows NT 4.0 with Service Pack 2. This description applies only to Windows 2000 and to Windows NT 4.0 with Service Pack 2 and later. For a description of this entry in operating systems earlier than Windows NT 4.0 with Service Pack 2, see the Windows NT 4.0 Resource Kit.

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.