Automotive Protocol
DoIP
DoIP (Diagnostics over Internet Protocol) is the standardized protocol for vehicle-diagnostic communication over Ethernet, specified by ISO 13400. It is the modern replacement for [OBD-II](/knowledge/glossary/obd-ii/) — CAN-based diagnostics where automotive Ethernet supplants the CAN bus as the primary diagnostic transport.
Definition
DoIP (Diagnostics over Internet Protocol) is the standardized protocol for vehicle-diagnostic communication over Ethernet, specified by ISO 13400. It is the modern replacement for OBD-II — CAN-based diagnostics where automotive Ethernet supplants the CAN bus as the primary diagnostic transport.
What it means
DoIP encapsulates the Unified Diagnostic Services (UDS — ISO 14229) protocol over TCP/UDP for in-vehicle and out-of-vehicle diagnostics. The shift to DoIP reflects the broader move toward automotive Ethernet (100BASE-T1, 1000BASE-T1) as the in-vehicle backbone, particularly in zonal architectures where central compute units talk to zonal controllers over Ethernet.
For offensive-security assessment, DoIP testing covers: routing-activation and authentication, UDS service enumeration over DoIP (programming sessions, security access, routine control), vehicle-announcement-protocol behavior on Ethernet broadcasts, and gateway behavior between DoIP and legacy in-vehicle networks. The security model on DoIP depends on the manufacturer's authentication strategy for diagnostic services — a poor authentication strategy on DoIP can be just as exploitable as on legacy OBD-II.
Related terms
Authoritative sources
- ISO 13400 (DoIP) - ISO 14229 (UDS)
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End of glossary-batch-5/article.md (9 terms: SROS2, RTPS, DDS, Embedded Linux, FreeRTOS, TrustZone, Secure boot, EPSS, DoIP).