%% You should probably cite draft-ietf-ipsecme-esp-ping instead of this I-D.
@techreport{colitti-ipsecme-esp-ping-01,
    number =    {draft-colitti-ipsecme-esp-ping-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-colitti-ipsecme-esp-ping/01/},
    author =    {Lorenzo Colitti and Jen Linkova and Michael Richardson},
    title =     {{ESP Echo Protocol}},
    pagetotal = 7,
    year =      ,
    month =     ,
    day =       ,
    abstract =  {This document defines an ESP echo function which can be used to detect whether a given network path supports IPv6 ESP packets.},
}