%% You should probably cite draft-ietf-behave-nat-behavior-discovery instead of this I-D.
@techreport{macdonald-behave-nat-behavior-discovery-00,
    number =    {draft-macdonald-behave-nat-behavior-discovery-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-macdonald-behave-nat-behavior-discovery/00/},
        author =    {Derek MacDonald and Bruce Lowekamp},
    title =     {{NAT Behavior Discovery Using STUN}},
    pagetotal = 21,
    year =      2006,
    month =     oct,
    day =       17,
    abstract =  {This specification defines a usage of the Simple Traversal Underneath Network Address Translators (NAT) (STUN) Protocol that allows the applications to discover the presence and current behaviour of NATs and firewalls between them and the STUN server.},
}