@techreport{cheshire-pcp-unsupp-family-06,
    number =    {draft-cheshire-pcp-unsupp-family-06},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-cheshire-pcp-unsupp-family/06/},
    author =    {Stuart Cheshire and Simon Perreault},
    title =     {{Updates to the PCP Specification}},
    pagetotal = 10,
    year =      2013,
    month =     oct,
    day =       21,
    abstract =  {The Port Control Protocol (PCP) allows clients to request mappings in NAT gateways and firewalls. This document specifies the PCP UNSUPP\_FAMILY error code, which enables PCP servers to inform clients when the requested external address family is not supported. This document also removes the requirement for the PCP server to validate the mapping nonce, which proved to be unhelpful in practice.},
}