%% You should probably cite rfc2667 instead of this I-D.
@techreport{ietf-ifmib-tunnel-mib-06,
    number =    {draft-ietf-ifmib-tunnel-mib-06},
    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-ifmib-tunnel-mib/06/},
    author =    {Dave Thaler},
    title =     {{IP Tunnel MIB}},
    pagetotal = 16,
    year =      1999,
    month =     jun,
    day =       16,
    abstract =  {This memo defines a Management Information Base (MIB) for use with network management protocols in the Internet community. In particular, it describes managed objects used for managing tunnels of any type over IPv4 networks. {[}STANDARDS-TRACK{]}},
}