METHOD OF BANDWIDTH CONTROL BY REWRITING ACK NUMBER

• US 20070239889A1
• Filed: 03/28/2007
• Published: 10/11/2007
• Est. Priority Date: 04/10/2006
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Homma, Hideki, Mochida, Kei
• Granted Patent: US 7,676,593 B2
• Time in Patent Office: Days
• US Class Current: 709/237
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures

Abstract

A network relay apparatus installed with a TCP shaper has a packet converter that changes an ACK number of a confirmation reply packet in response to downstream data transmitted from a WAN side host to a lower value while transferring the packet.

Claims

1. A network relay apparatus connecting with a first terminal and a second terminal, the network relay apparatus comprising:

a transmitter that transmits first data received from the first terminal to the second terminal and transmits second data received from the second terminal to the first terminal, the second data comprising acknowledgement information according to the first data; and

a data modifier that modifies the second data to change the acknowledgement information into an another acknowledgement information,

wherein said transmitter transmits the modified second data to the first terminal.

2. The network relay apparatus according to claim 1, wherein the acknowledgement information indicates that the second terminal received the first data.

3. The network relay apparatus according to claim 2, wherein the first data comprises substantial data and identification information of the substantial data, the acknowledgement information is determined according to the identification information.

4. The network relay apparatus according to claim 3, further comprising a memory that stores the acknowledgement information, wherein the data modifier change the acknowledge information in the second data into the another acknowledge information stored in said memory.

5. A network relay apparatus connecting with a first terminal and a second terminal, the network relay apparatus comprising:

a transmitter that transmits packet data received from the first terminal to the second terminal and transmits acknowledgement data received from the second terminal to the first terminal, the acknowledgement data comprising acknowledgement number; and

a data modifier that modifies the acknowledgement data to change the acknowledgement number,

wherein said transmitter transmits the modified acknowledgement data to the first terminal.

6. The network relay apparatus according to claim 5, the acknowledgement number indicates that the second terminal received the packet data.

7. The network relay apparatus according to claim 6, further comprising, a memory that stores first acknowledgement number of a first acknowledgement information corresponding to a first packet data transmitted to the second terminal,

wherein said data modifier modifies a second acknowledgement information corresponding to a second packet data transmitted to the second terminal, to change a second acknowledge number of the second acknowledgement data into the first acknowledgement number, and said transmitter transmits the modified second acknowledgement information to the first terminal.

8. The network relay apparatus according to claim 7, wherein the second acknowledgement number is smaller than the first acknowledgement number.

9. The data relaying method for transferring data between a first terminal and a second terminal, comprising:

transferring first data received from the first terminal to the second terminal;

receiving first acknowledgement information from the second terminal, the first acknowledgement information corresponding to the first data and comprising a first acknowledgement number;

storing the first acknowledgement number in a memory;

transferring second data received from the first terminal to the second terminal;

receiving a second acknowledgement information from the second terminal, the second acknowledgement information corresponding to the second data and comprising second acknowledgement number, the second acknowledgement number is larger that the first acknowledgement number;

modifying the second acknowledgement information to rewrite the second acknowledgement number with the first acknowledgement number stored in the memory; and

transmitting the modified second acknowledgement information to the first terminal.