Simple Message Protocol
This page provides IP protocol information on the Simple Message Protocol (SMP) detected by the Netify DPI engine. Please see the IP protocol catalog for information on other IP protocols.
SMP is the Simple Message Protocol, a lightweight protocol designed for straightforward message-passing communication between networked applications.
IP Protocol Details
- Name
- Simple Message Protocol
- Abbreviation
- SMP
- Status
- Inactive
- IANA Number
- 121
- IANA Keyword
- SMP
- Network Policy
- Drop
- Reference
- Simple Message Protocol
IP Protocol Status - Inactive
SMP is a little-documented 1990s-era protocol, and is historical, with no known modern deployment.
IP Protocol Network Policy
IP protocol #121 - Simple Message Protocol - 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.