IPSec 协议是一个比较

新的安全协议，而且非常复杂，目前应用还不够广泛。作为一个还没有完全成熟的协议，IPSec 在理论上和实践上都有一些问题有待改进-IPSec protocol is a relatively new security protocols, are very complex, the current application is not wide enough. As a not yet fully mature protocol, IPSec has some problems in the theory and practice could be improved