IPS - NTP v4 tab

Basic configuration

Maximum size of packets (bytes)

Enter the maximum size allowed for NTP v4 packets (default value: 72 bytes).

NTP modes

This list sets out the known NTP v4 modes (reserved, active symmetric, passive symmetric, client, server, broadcast, NTP control messages and private use) and the action applied to each one of them.

You can:

• Allow or prohibit modes individually by clicking on their associated action,
• Select all modes with the Select all button and apply a common action to them using Allow and Block.

Advanced properties

Reference ID management

Predefined Reference IDs tab

This list sets out the default Reference IDs (defined in the RFCs) and the action applied to each of them.

You can:

• Allow or prohibit Reference IDs individually by clicking on their associated action,
• Select all Reference IDs with the Select all button and apply a common action to them using Allow and Block.

Custom Reference ID tab

In this list, Reference IDs can also be added or deleted:

• Click on Add and specify the name of the Reference ID,
• Select a Reference ID or all Reference IDs with the Select all button and click on Delete.

Kiss of death packets

Predefined Reference IDs tab

This list sets out the default Reference IDs (defined in the RFCs) that may be involved in Kiss of Death attacks (DENY, RSTR, RATELCL, etc.) and the action applied to each one of them.

You can:

• Allow or prohibit Reference IDs individually by clicking on their associated action,
• Select all Reference IDs with the Select all button and apply a common action to them using Allow and Block.

Custom Reference ID tab

In this list, Reference IDs that may be involved in Kiss of Death attacks can be added or deleted

• Click on Add and specify the name of the Reference ID,
• Select a Reference ID or all Reference IDs with the Select all button and click on Delete.