JPH10303911A - Network terminal having broadcast notification destination changing function and broadcast notification destination changing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer a broadcast notifying packet to an optional destination of each network terminal by transmitting a broadcast notifying packet to a network with a function code stored in the packet. SOLUTION: A packet creating part 1 creates a broadcast notifying packet that has a broadcast address in a physical address of the opposite network terminal. In such cases, a function code is stored in the packet. When a LAN receiving interface part 3 decides that it is a packet for itself according to a physical address of the opposite network terminal in a received data packet, the part 3 receives it. A broadcast notifying packet identifying part 4 checks whether the received data packet is a broadcast notifying packet or not and delivers the packet to a broadcast notification destination changing part 5 in the case of a broadcast notifying packet. The part 5 acquires a function code of the broadcast notifying packet, acquires a broadcast notification destination that is defined in a corresponding function code from a function code destination conversion table 6, adds it to the broadcast notifying packet and transfers it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network terminal connected to a LAN, and more particularly to a network terminal having a broadcast notification destination change function having a function of transferring a broadcast notification to an arbitrary destination and a broadcast notification destination change method. .

[0002]

2. Description of the Related Art In a network connected by LAN type, a source network terminal transmits a data packet by storing a physical address of a destination network terminal and a destination logical address in the destination network terminal in a data packet. I do.

A normal data packet is received by a network terminal having the same physical address as that of the partner network terminal in the data packet, and is transferred to a destination logical address in the partner network terminal.

[0004]

In the case of performing broadcast transmission to a plurality of terminals in the above-mentioned conventional network, a data packet using a broadcast address as a physical address of a partner network terminal is used (hereinafter, broadcast). Notification packet). In this case, the broadcast notification packet received by each network terminal could only be sent to a specific destination in the network terminal. The reason is that the contents of the broadcast notification packets received by each network terminal are all the same, so that the destination logical address in the partner network terminal stored in the broadcast notification packet is also the same.

An object of the present invention is to provide a network terminal having a broadcast notification destination change function and a broadcast notification destination change method capable of transferring a broadcast notification packet to an arbitrary destination in each network terminal when performing a broadcast transmission. Is to provide.

[0006]

In order to achieve the above object, a network terminal according to the present invention comprises a means for transmitting a broadcast notification packet to a network by storing a function code in the packet and transmitting the broadcast notification packet to the network. Means for acquiring the destination of the broadcast notification packet based on the function code in the packet when the broadcast notification packet is received, based on the function code destination conversion table, and performing the broadcast notification in accordance with the change of the function code in the broadcast notification packet. The packet is transferred to an arbitrary destination in the receiving network terminal.

[0007] Further, the broadcast notification destination changing method of the present invention comprises:
The function code is stored in the broadcast notification packet and transmitted to the network.When the broadcast notification packet is received, the destination of the broadcast notification packet is acquired by referring to the function code destination conversion table based on the function code in the packet. And transmitting the broadcast notification packet to an arbitrary destination in the receiving network terminal in accordance with the change of the function code in the broadcast notification packet.

According to the present invention, when the network terminal receives a broadcast notification packet, the destination of the broadcast notification packet can be set from the function code in the packet. The broadcast notification packet can be transferred to any destination in the network terminal.

[0009]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the network terminal of the present invention. The network terminal shown in FIG. 1 includes a packet creating unit 1 for creating a broadcast notification packet.
And a LAN that sends broadcast notification packets to the network
The transmission interface unit 2 and an LA for receiving packets from the network and filtering received packets
N receiving interface unit 3, a broadcast notification packet identifying unit 4 for determining whether the packet received by the LAN receiving interface unit 3 is a broadcast notification packet, and a destination of the broadcast notification packet from the function code of the broadcast notification packet. It is composed of a broadcast notification destination changing unit 5 and a function code destination conversion table 6 in which a packet destination is set for each function code of the broadcast notification packet.

FIG. 2 is a flowchart showing the operation of the embodiment of FIG. The operation of the network terminal according to the present invention will be described with reference to FIGS. When it becomes necessary to transmit a broadcast notification, the packet creation unit 1 creates a broadcast notification packet having a broadcast address as the physical address of the partner network terminal. At this time, the function code is stored in the broadcast notification packet (step 10).
1). When the broadcast notification packet has been created, the LAN transmission interface unit 2 transmits this to the network (step 102).

When receiving a data packet from the network, the LAN receiving interface unit 3 checks whether the packet is addressed to itself from the physical address of the partner network terminal in the data packet, and receives the data packet if addressed to itself. Then, the packet is sent to the broadcast notification packet identification unit 4 (step 103). Broadcast notification packet identification unit 4
Checks whether the received data packet is a broadcast notification packet, and if it is a broadcast notification packet, passes the packet to the broadcast notification destination change suburb 5 (step 10).
4).

The broadcast notification destination changing unit 5 obtains the function code of the broadcast notification packet (step 105), and obtains the destination of the broadcast notification defined in the corresponding function code from the function code destination conversion table 6. (Step 106). The broadcast notification destination changing unit 5 adds the obtained broadcast notification destination to the broadcast notification packet (step 107), and performs packet transfer (step 108).

FIG. 3 is a diagram showing a data flow according to one embodiment of the present invention. One embodiment of the present invention will be described with reference to FIG. Network terminal 2 in LAN type network 201
02, 203, and 204 are connected. The network terminal 202 includes a packet creation unit 205 and a LAN transmission interface unit 206. Network terminal 20
3, a LAN reception interface unit 207, a broadcast notification packet identification unit 208, a broadcast notification destination change unit 209,
Function code destination conversion table 217, tasks 210 and 2
18, a LAN reception interface unit 220, a broadcast notification packet identification unit 2
21, a broadcast notification destination change unit 222, a function code destination conversion table 223, and a task 224.

First, the network terminals 202 to 203
2 shows a flow in the case of transmitting a normal data packet to.
The normal data packet 211 is created by the packet creating unit 205 of the network terminal 202. Data packet 2
11 includes a physical address unit 21
3 (the physical address of the network terminal 203 in this example) and the destination logical address 212 of the data packet.
(In this example, the task number 210) is stored. After the data packet 211 is created by the packet creation unit 205, it is transmitted from the LAN transmission interface unit 206 to the network 201.

The data packet 211 transmitted to the network 201 is received by the network terminals 203 and 204. The LAN reception interface unit 207 of the network terminal 203 receives the data packet 211 from the network 201 and checks the partner network terminal physical address unit 213. Since the physical address of the network terminal 203 is stored in the other party's network terminal physical address section 213 of the data packet 211, the LAN reception interface section 207 captures the data packet 211 and sends the broadcast notification packet identification section 208
Pass to.

The broadcast notification packet identification unit 208 checks whether the destination network terminal physical address unit 213 of the data packet 211 is a broadcast address.
The destination network terminal physical address part 213 of the data packet 211 is not a broadcast address,
Since this is the physical address of the network terminal 203, the data packet 211 passes through the broadcast notification destination change unit 209 and is transferred to the task 210.

The network terminal 204 receives the data packet 211. However, since the physical address of the network terminal 203 is stored in the partner network terminal physical address section 213, the data packet 211 is discarded by the LAN reception interface section 220. .

Next, the flow of a packet when the broadcast notification packet 214 is transmitted from the network terminal 202 will be described. When it becomes necessary to perform the broadcast notification, the packet creation unit 205 of the network terminal 202 transmits the broadcast notification packet 2
14 is created. In the broadcast notification packet 214, the broadcast address is stored in the physical address section 216 of the partner network terminal, and the function code storage area 215 is stored.
Stores a function code A. Broadcast notification packet 21
4 is created by the packet creation unit 205, transmitted from the LAN transmission interface unit 206 to the network 201, and received by the network terminals 203 and 204.

The LAN reception interface unit 207 of the network terminal 203 receives the broadcast notification packet 21
Since the broadcast address is stored in the other party's network terminal physical address unit 216, the broadcast notification packet 214 is fetched and the broadcast notification packet identification unit 2
Hand over to 08. The broadcast notification packet identification unit 208 passes this packet to the broadcast notification destination change unit 209 because the other party's network terminal physical address unit 216 of the broadcast notification packet 214 is a broadcast address.

The broadcast notification destination change unit 209 acquires the function code A from the function code storage area 215 of the broadcast notification packet 214, and obtains the function code destination conversion table 217.
From the broadcast notification (task number 21)
8). The broadcast notification destination changing unit 209 creates a data packet 219 in which the obtained broadcast notification destination is added to the broadcast notification packet 214, and transfers the data packet 219 to the task 218.

Similarly, at the node 204, the LAN reception interface unit 220 transmits the received broadcast notification packet 214 to the other party's network terminal physical address unit 216.
, The broadcast notification packet 214 is fetched and passed to the broadcast notification packet identification unit 221. The broadcast notification packet identification unit 221 includes:
Since this packet has a broadcast address, it is passed to the broadcast notification destination change unit 222.

The broadcast notification destination change unit 222 acquires the function code A from the function code storage area 215 of the broadcast notification packet 214, and stores the function code destination conversion table 223.
From the broadcast notification (task number 22)
4). The broadcast notification destination changing unit 222 creates a data packet 225 in which the obtained broadcast notification destination is added to the broadcast notification packet 214 and transfers it to the task 224.

The operation of one embodiment of the present invention has been described in detail with reference to the drawings. However, the present invention is not limited to this embodiment, and does not depart from the gist of the present invention. Even if there is a design change, it is included in the present invention.

[0025]

As described above, according to the present invention, when a network terminal receives a broadcast notification packet, the destination of the broadcast notification packet can be set from the function code in the broadcast notification packet. By changing the function code at the time of packet transmission, there is an effect that the broadcast notification packet can be transferred to an arbitrary destination in the network terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a network terminal according to the present invention.

FIG. 2 is a flowchart showing an operation of the embodiment of FIG. 1;

FIG. 3 is a diagram showing a data flow of one embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 packet creation unit 2 LAN transmission interface unit 3 LAN reception interface unit 4 broadcast notification packet identification unit 5 broadcast notification destination change unit 6 function code destination conversion table 100 to 108 processing step 201 network 202 network terminal (data transmission source) 203 , 204 Network terminal (data reception) 205 Packet creation unit 206 LAN transmission interface unit 207, 220 LAN reception interface unit 208, 221 Broadcast notification packet identification unit 209, 222 Broadcast notification destination change unit 210, 218, 224 Task 211 Normal Data packet 212 Destination logical address 213, 216 Remote network terminal physical address part 214 Broadcast notification packet 215 Function code storage area 217, 223 Function code destination conversion table Bull

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichiro Matsumoto 1-25-1, Shinurashima-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Inside of NEC Electric Robot Engineering Co., Ltd.

Claims (4)

[Claims] 1. A means for transmitting a broadcast notification packet, which is a data packet using a broadcast address as a physical address of a partner network terminal, to a network by storing a function code in the packet and receiving the broadcast notification packet from the network. A means for obtaining the destination of the broadcast notification packet based on the function code destination conversion table based on the function code in the packet, and according to the change of the function code in the broadcast notification packet,
A network terminal with a broadcast notification destination change function, which transfers a broadcast notification packet to an arbitrary destination in a receiving network terminal. 2. A packet creator for storing a function code in a packet when a broadcast notification packet, which is a data packet using a broadcast address as a physical address of a partner network terminal, is transmitted to the network. A transmission interface unit, a reception interface unit for receiving a packet from the network, a broadcast notification packet identification unit for determining whether the packet received by the reception interface unit is a broadcast notification packet, and a function code of the broadcast notification packet A function code destination conversion table in which a packet destination is set for each, a broadcast notification destination change unit that obtains the destination of the broadcast notification packet from the function code destination conversion table based on the function code in the broadcast notification packet; With broadcast notification destination change function, characterized by having Ttowaku terminal. 3. A function code is stored in a broadcast notification packet, which is a data packet using a broadcast address as a physical address of a partner network terminal, and transmitted to the network. When the broadcast notification packet is received, the function code in the packet is changed. Based on the function code destination conversion table, the destination of the broadcast notification packet is obtained, and according to the change of the function code in the broadcast notification packet,
A broadcast notification destination changing method, wherein a broadcast notification packet is transferred to an arbitrary destination in a receiving network terminal. 4. A function code is stored in a broadcast notification packet, which is a data packet using a broadcast address as a physical address of a partner network terminal, when a broadcast notification packet is created, and the broadcast notification packet is transmitted to the network. The connected receiving network terminal receives the broadcast notification packet from the network, determines whether the received packet is a broadcast notification packet, and responds to each function code based on the function code of the broadcast notification packet A destination of the broadcast notification packet from the function code destination conversion table in which the specified destination is defined, and transferring the broadcast notification packet to the obtained destination.