Abstract: A method and device for configuring a firewall in a computer system employing a rule for controlling access between a source resource and a destination resource only if said source and destination resources belong to the same protection domain. At a central configuration machine, an access control rule is specified, including a scope, for each resource group, the scope, and thus the access control rule is capable of being interpreted by each of the plurality of firewalls differently depending on the value of the scope and network resource characteristics associated with each of the plurality of firewalls.

Abstract: A method and device for configuring a firewall in a computer system employing a rule for controlling access between a source resource and a destination resource only if said source and destination resources belong to the same protection domain.

Abstract: Method and system for data communications between a first user station of a first network and a second user station of a second network via a network of the Internet type, in which, after an access terminal has obtained a public address intended for a communication between the first user station and the second user station, the access terminal is connected to the administrator, the administrator supplies the access terminal with connection data and supplies addressees with the connection data and the public address, and the access terminal establishes a communications tunnel with the second user station or with an access terminal of the second user station, then a communication with the second user station.