%% You should probably cite draft-ietf-opsec-ip-options-filtering instead of this I-D.
@techreport{gont-opsec-ip-options-filtering-04,
    number =    {draft-gont-opsec-ip-options-filtering-04},
    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-options-filtering/04/},
    author =    {Fernando Gont and Ran Atkinson and Carlos Pignataro},
    title =     {{Recommendations on filtering of IPv4 packets containing IPv4 options}},
    pagetotal = 30,
    year =      2012,
    month =     mar,
    day =       11,
    abstract =  {This document document provides advice on the filtering of IPv4 packets based on the IPv4 options they contain. Additionally, it discusses the operational and interoperability implications of dropping packets based on the IP options they contain.},
}