%% You should probably cite rfc2694 instead of this I-D.
@techreport{ietf-nat-dns-alg-04,
    number =    {draft-ietf-nat-dns-alg-04},
    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-nat-dns-alg/04/},
    author =    {Andy Heffernan and George Tsirtsis and Pyda Srisuresh and Praveen Akkiraju},
    title =     {{DNS extensions to Network Address Translators (DNS\_ALG)}},
    pagetotal = 29,
    year =      1999,
    month =     jun,
    day =       23,
    abstract =  {This document identifies the need for DNS extensions to NATs and outlines how a DNS Application Level Gateway (DNS\_ALG) can meet the need. This memo provides information for the Internet community.},
}