SRM has a built-in SPI (Stateful Packet Inspection) firewall, an advanced security mechanism that checks packets and keeps track of the state of network connections. An SPI firewall is enabled in SRM to provide significant advantages:

• Keeping track of the state of different network connections (e.g., TCP and UDP).
• In-depth inspection on packet states (e.g. packet source, destination, and more information).
• Enhanced dynamic protection against malicious packets based on connection states.