Adversaries may block access to Ethernet communications to prevent instructions or configurations messages from reaching target systems and devices. Ethernet connections allow for communications between IT and OT systems and devices. Blocking Ethernet communications may also block command and reporting messages.(Citation: Bonnie Zhu, Anthony Joseph, Shankar Sastry 2011) An adversary may block Ethernet communications by disabling network interfaces, [Service Stop](https://attack.mitre.org/techniques/T0881), or conducting an [Adversary-in-the-Middle](https://attack.mitre.org/techniques/T0830) attack and dropping the network traffic.

Linked Issues

Issuelinks
Linktype Issue
is related to Techniques
is related to Control Server
is related to Application Server
is related to Firewall
is related to Intelligent Electronic Device (IED)
is related to Distributed Control System (DCS) Controller
is related to Remote Terminal Unit (RTU)
is related to Virtual Private Network (VPN) Server
is related to Field I/O
is related to Data Gateway
is related to Safety Controller
is related to Programmable Logic Controller (PLC)
is related to Workstation
is related to Jump Host
is related to Switch
is related to Data Historian
is related to Programmable Automation Controller (PAC)
is related to Routers
is related to Human-Machine Interface (HMI)
is blocked by Network Segmentation
is blocked by Out-of-Band Communications Channel
is blocked by Network Allowlists
is blocked by Detection of Block Ethernet
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