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Application & OT Security · Advanced

EtherNet/IP

An industrial Ethernet protocol that carries the Common Industrial Protocol (CIP) over standard TCP/IP, used widely with Rockwell Automation equipment.

Definition

EtherNet/IP uses TCP 44818 for explicit messaging and UDP 2222 for implicit I/O. CIP Security adds TLS/DTLS-based device authentication and integrity, but many deployments lack it, so segmentation and monitoring remain essential.

Example

An industrial firewall restricts CIP write services to the engineering workstation's address.

Exam tip

The 'IP' stands for Industrial Protocol, not Internet Protocol.

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