key socket

And Linux kernel 2.6 also supported PF_ KEY socket, which made it possible for IKE to be implemented in user space, communicate with the kernel and supply SA of automatic negotiation for IPsec.

并且2.6内核支持PF KEY套接字。这样，IKE协议的实现可以在用户空间实现，利用PF KEY套接字与内核进行通信，为IPSec提供自动协商的SA。

The key technology is Java, JDBC and Socket.

所采用的关键技术是面向对象的网络编程工具Java、数据库连接技术JDBC和Java提供的使用TCP/IP协议的Socket类。

An extension of the PF-KEY socket and its implementation

PF-KEY套接字的扩展与实现