ISO Transport Protocol Class 4
This page provides IP protocol information on the ISO Transport Protocol Class 4 (ISO-TP4) detected by the Netify DPI engine. Please see the IP protocol catalog for information on other IP protocols.
ISO-TP4 is ISO Transport Protocol Class 4, the OSI reference model's connection-oriented transport protocol, roughly analogous to TCP, carried over IP.
IP Protocol Details
- Name
- ISO Transport Protocol Class 4
- Abbreviation
- ISO-TP4
- Status
- Inactive
- IANA Number
- 29
- IANA Keyword
- ISO-TP4
- Network Policy
- Drop
- Reference
- ISO Transport Protocol Class 4
IP Protocol Status - Inactive
ISO-TP4 was standardized in RFC 905 (1984) to let OSI transport-layer traffic run over an IP network, and became obsolete as OSI protocols were abandoned.
IP Protocol Network Policy
IP protocol #29 - ISO Transport Protocol Class 4 - is typically dropped by edge routers and firewalls. Advanced threat actors and malware families can use these non-standard IP protocol numbers for lateral movement (east-west communication) inside internal networks.