Deep packet inspection tries to investigate the structuring of each individual packet that passes through a firewall, and drop or block packets that appear to relate to a particular service. 

University of Connecticut

- Harvesting Attacks
- Deep Packet Inspection

Censorship Threats

https://loki.network/wp-content/uploads/2018/10/LokiWhitepaperV3_1.pdf

Loki Whitepaper

Harvesting attacks try to gather the IP addresses of all operating Service Nodes on the network and use ISP level firewalls to block connections to those particular addresses. This censorship is performed mainly on the Tor network. 

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