Research And Implementation Of Ipsec-based Vpn Gateway

In this paper,I take a lot time to the thorough analysis and study on IPSec protocol,VPN technology and Linux's kernel.Firstly,we particular research the ESP,AH and IKE protocol in the IPSec protocol family and bring out much advice to amend.Secondly, we particular research the key technology of VPN.Finaly,we take advantage of Linux's open source codes and HOOK mechanism of Netfilter firewall,and implement seamless conformity of TCP/IP and IPSec after hooking IPSec model with Linux system kernel by registered function.After that,I recompile the new system kernel and produce a truly safe kernel,then we achieve a safe VPN gateway based on the IPSec.I make test and analysis on the performance of VPN gateway on the school network.