%% You should probably cite rfc6887 instead of this I-D.
@techreport{ietf-pcp-base-29,
    number =    {draft-ietf-pcp-base-29},
    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-pcp-base/29/},
    author =    {Dan Wing and Stuart Cheshire and Mohamed Boucadair and Reinaldo Penno and Paul Selkirk},
    title =     {{Port Control Protocol (PCP)}},
    pagetotal = 88,
    year =      2012,
    month =     nov,
    day =       7,
    abstract =  {The Port Control Protocol allows an IPv6 or IPv4 host to control how incoming IPv6 or IPv4 packets are translated and forwarded by a Network Address Translator (NAT) or simple firewall, and also allows a host to optimize its outgoing NAT keepalive messages.},
}