Telescope nDAG Live

In addition to post-processing archived pcap files, STARDUST users can also perform real-time analysis against a live feed of the traffic observed at the UCSD network telescope. This feed is known as the “nDAG stream”. DAG refers to the DAG hardware capture card that is used to capture the telescope traffic and the “n” stands for “network” (to reflect that we are taking a DAG capture and exporting it directly to multiple users via a network).The nDAG methodology and protocol were invented specifically for the STARDUST project.There are two streams of packets: raw packets and tagged packets. Raw packets are the original data and are formatted exactly like pcap data, while tagged packets contain more information through processing.