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IMPORTANT
SNS 3.x versions have reached End of Maintenance since July 1st, 2024.
We recommend that you update your SNS firewalls to a version with maintenance to guarantee the protection of your infrastructure.

# IPS - NTP v2 tab

## Basic configuration

Maximum size of packets (bytes) | Enter the maximum size allowed for NTP v2 packets (default value: 72 bytes).

### NTP modes

This list sets out the known NTP v2 modes (reserved, active symmetric, passive symmetric, client, server, broadcast, NTP control messages and private use) and the action applied to each one of them.

The action (Analyze / Block) applied to each mode can be changed by double-clicking in the corresponding action column.

## Advanced properties

### Prohibited Reference IDs

This list makes it possible to block additional NTP Reference IDs (LOCL, LCL, etc.) by specifying their names. It is possible to Add or Delete elements to or from this list by clicking on the relevant buttons.