2.2.2.1 Vendor-Specific Value for the Tunnel-Type RADIUS Attribute

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In addition to the values specified in [RFC2868], the standard RADIUS attribute Tunnel-Type [RFC2868] is extended to include a value for the Secure Socket Tunneling Protocol (as specified in [MS-SSTP]) of 0x013701 in network-byte order.  This value was determined using the technique specified in [RFC2882], in which "Vendor-Specific Values" are encoded by concatenating the private enterprise ID [IANA-ENT] with an 8-bit unsigned integer value. In this case, a tunnel tag of zero is always used, along with the Microsoft private enterprise ID (0x0137) and an 8-bit unsigned integer value 0x01.  As a result, the 4 octet value of the attribute (including the tag) is encoded as 0x00013701.<4>