%% You should probably cite rfc7283 instead of this I-D.
@techreport{ietf-dhc-dhcpv6-unknown-msg-04,
    number =    {draft-ietf-dhc-dhcpv6-unknown-msg-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-dhc-dhcpv6-unknown-msg/04/},
    author =    {Yong Cui and Qi Sun and Ted Lemon},
    title =     {{Handling Unknown DHCPv6 Messages}},
    pagetotal = 6,
    year =      2013,
    month =     dec,
    day =       16,
    abstract =  {DHCPv6 is not specific about handling messages with unknown types. This memo describes the problems and defines how a DHCPv6 server, client or relay agent should behave when receiving unknown DHCPv6 messages. This document updates RFC3315.},
}