%% You should probably cite draft-ietf-ipsecme-ikev1-algo-to-historic instead of this I-D.
@techreport{pwouters-ikev1-ipsec-graveyard-06,
    number =    {draft-pwouters-ikev1-ipsec-graveyard-06},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-pwouters-ikev1-ipsec-graveyard/06/},
    author =    {Paul Wouters},
    title =     {{Deprecation of IKEv1 and obsoleted algorithms}},
    pagetotal = 6,
    year =      2021,
    month =     feb,
    day =       21,
    abstract =  {Internet Key Exchange version 1 (IKEv1) is deprecated. Accordingly, IKEv1 has been moved to Historic status. A number of old algorithms that are associated with IKEv1, and not widely implemented for IKEv2 are deprecated as well. IANA is instructed to close all IKEv1 registries.},
}