封包过滤 meaning in English

dynamic packet filtering
packer filter
packet sniffers

Packet filtering router
封包过滤路由器
The sixth part designs in detail the applied layer data package filter module , including the web page contents filter module , application filter module and web site filter module and designs icmp data package filter module , net neighbor filter module , etc . in the core layer module
第六部分详细设计了应用层封包过滤模块中的站点、应用程序、网页内容过滤模块，和核心层封包过滤模块中的icmp和网上邻居等过滤模块。