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Levels of Security of Interfaces

Level of security should be set for each network interface installed on your system in accordance with security policy. Incoming packets are passed thru or blocked basing on this setting. The following levels of security of interfaces are supported: 

  • Low Security
  • 1st Level Stealth Security
  • 2nd Level Stealth Security
  • 3rd Level Stealth Security
  • High security
  • Emergency level

Low level of security means the network interface acts as follows: everything that is not forbidden is allowed. All packets are passed thru except for those that are not prohibited by security rules.

1st Level Stealth Security means the network interface works in incoming packets checking mode, ensuring the address of an incoming packet complies with your request. Any incoming packet that does not comply with your request will be blocked.

2nd Level Stealth Security means the network interface works in incoming packets checking mode, ensuring the address and protocol of an incoming packet complies with your request. Any incoming packet that does not comply with your request will be blocked.

3rd Level Stealth Security means the network interface works in incoming packets checking mode, ensuring the address, protocol and port of an incoming packet complies with your request. Any incoming packet that does not comply with your request will be blocked.

High level of security means the network interface acts as follows: everything that is not allowed is forbidden. All packets are blocked except for those that are allowed by security rules.

To select a level of security for network interface

1.       Click the desired network interface node in program tree.

2.       Move the slider to the desired level of security in the window that appears.

Note

  • Regardless of level of security set for a network interface, each packet is first checked for compliance with security rules; it is checked for compliance with level of security of local system only in case that no rule is sufficient to determine whether a packet should be passed thru or blocked.

Important

  •  All packets are blocked in Emergency level, regardless of security rules in use.