| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tunneling device which is capable of operating LANs through an IP network as a common VPN. SOLUTION: An LAN-side port has a function of receiving the entire frame 121 of a data link layer flowing through a network, forming (encapsulated) an IP packet 125 that contains the received frame as data, and transmitting the IP packet 125 from the IP network-side port to a tunneling terminal station. An IP network-side port has a function of receiving the IP packet 125 addressed to it, taking out the frame 121 of the data link layer from the IP packet 125 when the IP packet 125 is the encapsulated frame of the data link layer, and transmitting the frame 121 from the LAN-side port.</p> |
