The automation based approach is the widely preferred pattern/regular expression matching technique which uses a finite state machine for the pattern matching. In statistical analysis, the focus is on the classification of the traffic rather than payload and gathering generic information like packet length, port numbers to classify the traffic. Port-based is the standard protocol identification approach which inspects the port fields in the TCP/UDP headers for the commonly assigned port numbers to the respective protocol. Some of the popular methods used include port-based, statistical, and automation-based approaches. There are several methods that are used by DPI to perform the inspection.
PACKET SENDER ALTERNATIVE SOFTWARE
DPI can be applied through a physical device or software application. The analysis can also introduce latency in the transmission of the packets. It can help in identifying malicious packets, intrusions, and while performing traffic management as well.ĭPI strips down the header and footer from the packet and inspects the payload to perform signature matching, looking for specific string and other details.Īpplication of DPI on a large scale requires high-end computing resources for the analysis of collected data. The introduction of the DPI brings analysis of the packet content into the picture, which can be used for several purposes. It can dig deeper and get some granular information like the application to which the packet belongs and the packet content. What is Deep Packet Inspection?ĭPI allows us to inspect the packets beyond header and footer. Instead of making a decision based on IP address, MPI takes into consideration the packet type to perform the action. The pre-loaded parse list can be updated anytime by the administrator.
The sole purpose of these proxies is to analyze the packet headers, including the type of the packet based on its data format and compare it with the loaded parse-list to allow or refuse its transmission. MPI points to application proxies/device which acts as an intermediary service between the end user and the Internet gateways. Generic firewalls make use of this type of inspection methodology to block the unwanted connections from the blacklisted IPs. Its scope is limited to the layer 2 and 3 of the OSI model. The information obtained is used for routing the packet to the destination address. SPI inspects the packet’s header to identify the source and destination IP address. Packet Inspection is not a new concept DPI is an addition to this existing technique, which takes the packet inspection game to another level. It makes use of the destination address to route it. Different hops present in the path will not look at the body/content of a packet. The packets sent over the Internet are routed similarly each packet contains the source and destination IP address which is used to successfully deliver packets to the intended recipients. The postal service will be able to make use of the address mentioned on the cover to deliver the letter and does not check the content inside it. We can compare a data packet with our traditional mailing system where a letter contains information like name and address of the sender and receiver along with the content for the intended receiver. It includes our VOIP calls (like Skype), websites we visit, and the emails we send. All the communication that happens over the internet makes use of ‘packets’ to transfer data. Deep Packet Inspection (DPI) is used for in-depth analysis of the packets sent over the internet.
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