%% You should probably cite rfc2401 instead of this I-D.
@techreport{ietf-ipsec-arch-sec-06,
    number =    {draft-ietf-ipsec-arch-sec-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-ipsec-arch-sec/06/},
    author =    {Ran Atkinson and Stephen Kent},
    title =     {{Security Architecture for the Internet Protocol}},
    pagetotal = 66,
    year =      1998,
    month =     jul,
    day =       7,
    abstract =  {This memo specifies the base architecture for IPsec compliant systems. {[}STANDARDS-TRACK{]}},
}