Openbsd PF：OpenBSD数据包过滤器
（Unix平台）象其它平台上的Netfilter和IPFilter相同，OpenBSD用户最爱用PF，这即是他们的防火墙工具。它的功能有网络地址转换、管理TCP/IP通信、提供带宽控制和数据包分级控制。它还有一些额定的功能，例如被迫操作系统查看。PF是由编写OpenBSD的同一批人编写的，所以您完全可以放心使用，它现已通过了很好的评价、设计和编码以预防露出其它包过滤器（otherpacketfilters）上的相似漏洞。((Unix platforms) Like Netfilter and IPFilter on other platforms, OpenBSD users prefer PF, which is their firewall tool. Its functions include network address translation, management of TCP/IP communications, and provision of bandwidth control and packet-level control. It also has some extra features like forced OS viewing. PF was written by the same people who wrote OpenBSD, so you can use it with confidence that it is well-reviewed, designed, and coded to prevent exposing similar vulnerabilities on other packet filters.)
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