Deep Packet Inspection1 네트워크 방화벽 SPI DPI 방식 Stateful Packet Inspection (SPI) What is an SPI firewall? SPI is a basic firewalling feature that is included in standard DSL routers (e.g. SpeedTouch routers). How does SPI work? SPI works at the network layer by examining a packets header and footer in addition to ensuring the packet belongs to a valid session. When an IP packet arrives at the firewall from the Internet the firewall decides if.. 2009. 9. 4. 이전 1 다음