RADIUS attribute from microsoft
HCAP-User-Name is a VSA used to indicate user identity information received over a HCAP interface by a RADIUS client. The fields of HCAP-User-Name MUST be set as follows: Vendor-Type: An 8-bit unsigned integer that MUST be set to 0x3C. Vendor-Length: An 8-bit unsigned integer that MUST be set to the length of the Attribute-Specific Value field plus 2. Its value MUST be at least 3. Attribute-Specific Value: An octet string that contains characters from Windows ANSI code page (for more information, see ) and MUST specify the name for the HCAP user (as specified in ).