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Communication method and communication apparatus

Inactive Publication Date: 2005-08-11
HARA KAZUHIRO P +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021] According to the second embodiment of the invention, the bridge type feed supporting the bi-directional communication such as UDLR can reduce the number of times an unnecessary packet is transferred to the uni-directional communication line. The unnecessary packet means the packet which does not require to be transferred to the uni-directional communication line, among the packets flowing through a bi-directional communication line connected to the feed.

Problems solved by technology

However, the UDLR, which is a technique for using the uni-directional communication line as the bi-directional communication line in the form of the dummy cannot be realized.
Consequently, a resource such as CPU is wasted.
As a result, the resource such as CPU is wasted.

Method used

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  • Communication method and communication apparatus

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first embodiment

[0059] the invention will be described below with reference to FIGS. 16 to 26. In FIGS. 16 to 26 for describing the first embodiment, elements corresponding to the elements in FIGS. 1, 2 and 7 to 12 described as the prior art are indicated by the same reference numerals, and the detailed description of these elements is omitted.

[0060] Basic processing of the first embodiment is to add a new third interface 12 to a bridge type feed and thereby change the feed to a feed 1c having three interfaces, as shown in FIG. 16. The new interface 12 is a bi-directional interface for receiving a GRE packet. As shown in FIG. 17, the interface 12 may be connected to a different interface 13b from an interface 13a to which an interface 5b of the feed 1c is connected, among the interfaces of a router 6 to which the interface 5b is connected. Moreover, the interface 12 may be connected to a different router 14 from the router 6, as shown in FIG. 18. In any case, the interface 12 has an IP address belo...

second embodiment

[0072] The basic processing of the second embodiment is that a feed 101 stores the addresses of nodes (communication equipment such as a router 114 and a host 115) connected to a local network 105 so as not to transfer the packet addressed to the node connected to the local network 105 to a UDL network 106.

[0073] In order to perform this basic processing, the feed 101 learns the addresses of the nodes connected to the local network 105. First, this learning processing will be described. Next, how the feed 101 prevents the transfer of a useless packet to the UDL network 106 by use of the learned addresses will be described. Subsequently, how the feed 101 automatically updates the learned addresses will be described. Finally, a scheme for implementation will be described. For the description, the local network 105 and a tunnel network 107 are assumed to be Ethernet such as 10BASE-T or 100BASE-TX. However, these networks do not have to be Ethernet. Any network will do as long as it per...

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Abstract

To allow bi-directional communication by using a bridge type feed and to reduce a load on equipment such as a receiver connected to a UDL network, a communication apparatus for carrying out communication on the Internet using an uni-directional communication line comprises an interface (5b) for receiving IP datagram to be transmitted to the communication line at the side for transmitting data to the communication line, and an interface (12) for realizing a virtual communication route from the receiving side to the transmitting side on the communication line, for carrying out bi-directional communication as UDLR. Moreover, the apparatus determines a destination of a packet inputted to the feed through predetermined interface, then determines which network the packet should be transferred to in accordance with the determined destination of the packet, and then transfers the packet through a predetermined interface only when transfer is necessary.

Description

BACKGROUND OF TEE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to a communication method for carrying out Internet communication using a uni-directional communication line such as a satellite line and a communication apparatus to be applied to the communication method. [0003] 2. Description of the Related Art [0004] Communication equipment (a transmitter) for transferring IP datagram flowing through a certain communication line to a uni-directional communication line such as a satellite line is called a feed. During transfer, the feed performs media conversion (encoding) for feeding data coming through a certain communication line through the uni-directional communication line. The feed is considered to be implemented as a router or a bridge. Some feeds functioning as a router implement UDLR (Uni-Directional Link Routing), which is a technique for using the uni-directional communication line as a bi-directional communication line in the form of a dummy (fo...

Claims

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Application Information

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IPC IPC(8): H04L12/28H04L12/46H04L12/56H04L12/66
CPCH04L12/4625H04L45/24H04L45/00H04L12/5692
Inventor HARA, KAZUHIRO P.FUJII, NOBORU
Owner HARA KAZUHIRO P
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