%% You should probably cite rfc5265 instead of this I-D.
@techreport{ietf-mip4-vpn-problem-solution-05,
    number =    {draft-ietf-mip4-vpn-problem-solution-05},
    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-mip4-vpn-problem-solution/05/},
    author =    {Sami Vaarala and Espen Klovning},
    title =     {{Mobile IPv4 Traversal across IPsec-Based VPN Gateways}},
    pagetotal = 39,
    year =      2008,
    month =     mar,
    day =       14,
    abstract =  {This document outlines a solution for the Mobile IPv4 (MIPv4) and IPsec coexistence problem for enterprise users. The solution consists of an applicability statement for using Mobile IPv4 and IPsec for session mobility in corporate remote access scenarios, and a required mechanism for detecting the trusted internal network securely. {[}STANDARDS-TRACK{]}},
}