%% You should probably cite draft-ietf-opsec-ip-security instead of this I-D.
@techreport{gont-opsec-ip-security-01,
    number =    {draft-gont-opsec-ip-security-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-gont-opsec-ip-security/01/},
    author =    {Fernando Gont},
    title =     {{Security Assessment of the Internet Protocol version 4}},
    pagetotal = 72,
    year =      2008,
    month =     aug,
    day =       31,
    abstract =  {This document contains a security assessment of the IETF specifications of the Internet Protocol version 4, and of a number of mechanisms and policies in use by popular IPv4 implementations. It is based on the results of a project carried out by the UK's Centre for the Protection of National Infrastructure (CPNI).},
}