%% You should probably cite rfc2809 instead of this I-D.
@techreport{ietf-radius-tunnel-imp-07,
    number =    {draft-ietf-radius-tunnel-imp-07},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-radius-tunnel-imp/07/},
    author =    {Glen Zorn and Dr. Bernard D. Aboba},
    title =     {{Implementation of L2TP Compulsory Tunneling via RADIUS}},
    pagetotal = 23,
    year =      1999,
    month =     aug,
    day =       23,
    abstract =  {This document discusses implementation issues arising in the provisioning of compulsory tunneling in dial-up networks using the L2TP (Layer Two Tunneling Protocol) protocol. This memo provides information for the Internet community.},
}