%% You should probably cite rfc9268 instead of this I-D.
@techreport{ietf-6man-mtu-option-11,
    number =    {draft-ietf-6man-mtu-option-11},
    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-6man-mtu-option/11/},
    author =    {Bob Hinden and Gorry Fairhurst},
    title =     {{IPv6 Minimum Path MTU Hop-by-Hop Option}},
    pagetotal = 22,
    year =      2021,
    month =     sep,
    day =       30,
    abstract =  {This document specifies a new IPv6 Hop-by-Hop option that is used to record the minimum Path MTU along the forward path between a source host to a destination host. The recorded value can then be communicated back to the source using the return Path MTU field in the option.},
}