@misc{rfc3514,
    series =    {Request for Comments},
    number =    3514,
    howpublished =  {RFC 3514},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3514},
    url =       {https://www.rfc-editor.org/info/rfc3514},
    author =    {Steven Bellovin},
    title =     {{The Security Flag in the IPv4 Header}},
    pagetotal = 6,
    year =      2003,
    month =     apr,
    day =       1,
    abstract =  {Firewalls, packet filters, intrusion detection systems, and the like often have difficulty distinguishing between packets that have malicious intent and those that are merely unusual. We define a security flag in the IPv4 header as a means of distinguishing the two cases. This memo provides information for the Internet community.},
}