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.

Data and Resources

Field Value
creationMethod <p><span style="color: rgb(56, 63, 69);">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).</span></p><p><br></p><p><span style="color: rgb(56, 63, 69);">There are two streams of packets: raw packets and tagged packets. Raw packets are the original data and are formatted exactly like&nbsp;</span><a href="https://www.caida.org/projects/network_telescope/docs/data/pcap/" rel="noopener noreferrer" target="_blank" style="color: rgb(63, 84, 129); background-color: rgb(255, 255, 255);">pcap data</a><span style="color: rgb(56, 63, 69);">, while tagged packets contain more information through processing.</span></p>
dataAuthType public
dataType pcap
datasetPageUrl https://catalog.caida.org/dataset/telescope_ndag_live
docsURL https://catalog.caida.org/dataset/telescope_ndag_live
doi https://doi.org/10.21986/CAIDA.DATA.TELESCOPE-NERSC
issueDate 2003-11-06
lastUpdateDate 2025-12-03
license other
min_gpu {}
ndp_creator_md5 10b82778352e3fc35792c701663926a9
otherLicense https://www.caida.org/about/legal/aua/public_aua/
pocEmail info@caida.org
pocName CAIDA
pocWebsite https://catalog.caida.org
req_gpu {}
status submitted
theme []
uploadType dataset
Groups
  • NSF
  • United States
Tags
  • NSF
  • United States
  • caida
  • telescope
  • telescope-real-time
  • traffic
  • ucsd-network-telescope
isopen False
metadata_created 2026-10-30T17:06:11.458629
metadata_modified 2026-10-30T17:06:11.458633
notes <p>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).</p><p><br></p><p>The nDAG methodology and protocol were invented specifically for the STARDUST project.</p><p><br></p><p>There are two streams of packets: raw packets and tagged packets. Raw packets are the original data and are formatted exactly like&nbsp;<a href="https://www.caida.org/projects/network_telescope/docs/data/pcap/" rel="noopener noreferrer" target="_blank" style="color: rgb(63, 84, 129);">pcap data</a>, while tagged packets contain more information through processing.</p>
num_resources 1
num_tags 7
title Telescope nDAG Live