%% You should probably cite rfc5780 instead of this I-D.
@techreport{ietf-behave-nat-behavior-discovery-08,
    number =    {draft-ietf-behave-nat-behavior-discovery-08},
    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-behave-nat-behavior-discovery/08/},
    author =    {Derek MacDonald and Bruce Lowekamp},
    title =     {{NAT Behavior Discovery Using Session Traversal Utilities for NAT (STUN)}},
    pagetotal = 27,
    year =      2009,
    month =     sep,
    day =       27,
    abstract =  {This specification defines an experimental usage of the Session Traversal Utilities for NAT (STUN) Protocol that discovers the presence and current behavior of NATs and firewalls between the STUN client and the STUN server. This document defines an Experimental Protocol for the Internet community.},
}