%% You should probably cite draft-wing-pcp-base instead of this I-D.
@techreport{wing-softwire-port-control-protocol-02,
    number =    {draft-wing-softwire-port-control-protocol-02},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-wing-softwire-port-control-protocol/02/},
    author =    {Dan Wing and Reinaldo Penno and Mohamed Boucadair},
    title =     {{Pinhole Control Protocol (PCP)}},
    pagetotal = 32,
    year =      2010,
    month =     jul,
    day =       10,
    abstract =  {Pinhole Control Protocol is an address-family independent mechanism to control how incoming packets are forwarded by upstream devices such as IPv4 NAT devices, NAT64 devices, and IPv6 firewalls.},
}