The intrusion prevention feature lets you select the types of intrusion attacks that you want your firewall to neutralize. In the main window of the program, click Firewall. Then click Settings.
The Intrusion prevention section displays a list of the attacks the firewall can protect against.
The Intrusion Detection System (IDS) is a program used to detect unauthorized access to a PC or a network.
It performs a detailed analysis of the network traffic, comparing it against identifiers of known attacks or suspicious behavior, such as port scanning, malformed packets, etc. The IDS doesn't just analyze the type of traffic, it also checks its content and behavior.