%% You should probably cite draft-ietf-ipsecme-ad-vpn-problem instead of this I-D.
@techreport{ietf-ipsecme-p2p-vpn-problem-02,
    number =    {draft-ietf-ipsecme-p2p-vpn-problem-02},
    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-ipsecme-p2p-vpn-problem/02/},
    author =    {Steve Hanna and Vishwas Manral},
    title =     {{Auto Discovery VPN Problem Statement and Requirements}},
    pagetotal = 14,
    year =      2012,
    month =     jul,
    day =       9,
    abstract =  {This document describes the problem of enabling a large number of systems to communicate directly using IPsec to protect the traffic between them. It them expands on the requirements, for such a solution. Manual configuration of all possible tunnels is too cumbersome in many such cases. In other cases the IP address of end points change or the end points may be behind NAT gateways, making static configuration impossible. The Auto Discovery VPN solution is chartered to address these requirements.},
}