| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the security of communication by preparing a constitution in which a transmitting IP node reports the IP addresses of both transmitting and receiving nodes, the transport layer protocol to be used and the TCP/IP port number and then the transmission is inhibited for the pocket number of the node stored by the transmitting node after the virtual connection has been set. SOLUTION: A network application 10 selects a specific port of TCP ports 14 and UDP ports 15 and sends a packet to it. An IP-processing part 13 processes an IP layer to give a header to it and sends a packet to an ATM VC termination part 16. The part 16 reads the received packet, a TCP/UDP header and an IP reader and retrieves whether or not a VC has been set. If the setting of the VC is confirmed, the part 16 decides the permission or inhibition for transmission of a packet by making a reference to a VC management table 21. Thus, the security of an IP node is enhanced by previously setting a desired filtering rule for an ATM exchange with regards to security.</p> |
