@techreport{antony-ipsecme-ikev2-fragment-acknowledgment-03,
    number =    {draft-antony-ipsecme-ikev2-fragment-acknowledgment-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-antony-ipsecme-ikev2-fragment-acknowledgment/03/},
    author =    {Antony Antony and Steffen Klassert and Tobias Brunner},
    title =     {{IKEv2 Fragment Acknowledgment Extension}},
    pagetotal = 12,
    year =      2026,
    month =     jan,
    day =       21,
    abstract =  {This document specifies an extension to the Internet Key Exchange Protocol Version 2 (IKEv2) that enables acknowledgment of IKEv2 message fragments over UDP. The mechanism allows an IKE peer to confirm reception of individual fragments during the IKE\_AUTH exchange and any subsequent exchanges where IKEv2 Fragmentation is used. Support for this feature is negotiated using a new Notify Message Status Type during IKE\_SA\_INIT, and fragment acknowledgments are exchanged using a separate Notification payload. This extension improves reliability when large IKE messages are exchanged, such as those containing post-quantum cryptography (PQC) payloads, and reduces retransmission overhead, thereby improving IKEv2 round-trip times in lossy network conditions.},
}