一个国外的VB防火墙，很好懂的。一般情况下还是用得上的。已经反译成中文了。-a foreign VB firewall, a good read. Under normal circumstances or the ebb and flow. Has been translated into anti-Chinese.

VB防火墙源代码，一个很小的例子程序，仅供参考-VB firewall source code, a small example program for reference only