%% You should probably cite rfc6939 instead of this I-D.
@techreport{ietf-dhc-dhcpv6-client-link-layer-addr-opt-00,
    number =    {draft-ietf-dhc-dhcpv6-client-link-layer-addr-opt-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-ietf-dhc-dhcpv6-client-link-layer-addr-opt/00/},
    author =    {Gaurav Halwasia and Shwetha Bhandari and Wojciech Dec},
    title =     {{Client Link-layer Address Option in DHCPv6}},
    pagetotal = 6,
    year =      2012,
    month =     jul,
    day =       3,
    abstract =  {This document specifies the format and mechanism that is to be used for encoding client link-layer address in DHCPv6 messages by defining a new DHCPv6 Client Link-layer Address option.},
}