Patent ID: 6353856
Filing Date: 2002-03-05
Classification: H04L,H04Q

Abstract:
A firewall system, for use with a communications system in which, over a connection-oriented network that exchanges fixed-length packets to conform to a first protocol, communication traffic that conforms to a second protocol is transferred, that controls communications that conform to the second protocol comprising:a switching node for exchanging fixed-length packets and extracting from received fixed-length packets a fixed-length packet that contains a request made by a first terminal for access to a second terminal, the access request being based on the second protocol; and an agent unit, installed in the network, for judging before establishing a connection based on the first protocol between said switching node and the second terminal whether to grant the request for access to the second terminal or not on the basis of information contained in the fixed-length packet extracted by said switching node, wherein said agent unit establishes a connection based on the first protocol and a connection based on the second protocol between the first terminal or a terminal that accommodates the first terminal and the second terminal or a terminal that accommodates the second terminal, only when the access is granted.