@misc{rfc4093,
    series =    {Request for Comments},
    number =    4093,
    howpublished =  {RFC 4093},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4093},
    url =       {https://www.rfc-editor.org/info/rfc4093},
    author =    {Farid Adrangi and Henrik Levkowetz},
    title =     {{Problem Statement: Mobile IPv4 Traversal of Virtual Private Network (VPN) Gateways}},
    pagetotal = 19,
    year =      2005,
    month =     aug,
    abstract =  {Deploying Mobile-IP v4 in networks that are connected to the Internet through a Virtual Private Network (VPN) gateway presents some problems that do not currently have well-described solutions. This document aims to describe and illustrate these problems, and to propose some guidelines for possible solutions. This memo provides information for the Internet community.},
}