%% You should probably cite draft-ietf-ipsecme-ipv6-ipv4-codes instead of this I-D.
@techreport{boucadair-ipsecme-ipv6-ipv4-codes-00,
    number =    {draft-boucadair-ipsecme-ipv6-ipv4-codes-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-boucadair-ipsecme-ipv6-ipv4-codes/00/},
    author =    {Mohamed Boucadair},
    title =     {{IKEv2 Notification Codes for IPv4/IPv6 Coexistence}},
    pagetotal = 5,
    year =      2017,
    month =     oct,
    day =       6,
    abstract =  {This document specifies new IKEv2 notification codes to better manage IPv4 and IPv6 co-existence.},
}