1A Huttunen,et al.UDP Encapsulation of IPSec Packets[M].Negotiation of NAT-Traversal in the IKE,draft-ietf-ipsec-udp-encaps-00.txt,2001.
2M Borelia.Realm Specific IP:Framework[M].IETF draft.2000.
3RFC2709-Srisuresh.Security Model with Tunnel-mode Ipsec for NAT Domains Framework[M].IETF.2001.
4N aganand Doraswamy,DanHarkins.IPSec:the new security standard for the internet,intranet,and virtual private networks[M].Prentice Hall PTR,1999.
5RFC2574-User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3) Framework[M].IETF .April 1999.
6Kenichi Kourai, Toshio Hirotsu, Koji Sato, et al. Secure and Manageable Virtual Private Networks for End-Users [ EB/OL]. http://www. csg. is. titech.ac. jp/-kourai/paper/kourai-Icn2003.pdf,2003.
7Keng Lim, Jun Gao, Eugene Ng, et al. Customizable Virtual Private Network Service with QoS [EB/OL]. http://www-2. cs. cmu. edu/afs/cs/project/cmcl/archive/Darwin-papers/cn-vpn01.pdf.2003-01.
8G Huston Telstra. Next Steps for the IP QoS Architecture[EB/OL].RFC 2990, http ://www. faqs. org/rfcs/rfc2990.html,2000.
9D Maughan, M Schertler, et al. Internet Security Association and Key Management Protocol (ISAKMP) [EB/OL]. RFC 2408, http://www. faqs. org/ffcs/ffc2408.html, 2000-11.
10B Gleeson, A Lin , et al. A Framework for IP-based Virtual Private Networks[ EB/OL], RFC 2764, http://rfc2764. x42. com/,2000-02.
