%% You should probably cite rfc6691 instead of this I-D.
@techreport{ietf-tcpm-tcpmss-04,
    number =    {draft-ietf-tcpm-tcpmss-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-ietf-tcpm-tcpmss/04/},
    author =    {David Borman},
    title =     {{TCP Options and MSS}},
    pagetotal = 9,
    year =      2012,
    month =     mar,
    day =       29,
    abstract =  {This memo discusses what value to use with the TCP MSS option, and updates RFC 879 and RFC 2385.},
}