Method for forwarding data packets by a router

• US 20050041674A1
• Filed: 01/30/2004
• Published: 02/24/2005
• Est. Priority Date: 01/27/2003
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Rooney, Sean G.
• Granted Patent: US 7,355,974 B2
• Time in Patent Office: Days
• US Class Current: 370/401
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast
• CPC Class Codes: H04L 12/1836 with heterogeneous network architecture
• CPC Class Codes: H04L 12/1886 with traffic restrictions for efficiency improvement, e.g. involving subnets or subdomains
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/16 Multipoint routing
• CPC Class Codes: H04L 45/30 Routing of multiclass traffic
• CPC Class Codes: H04L 67/63 Routing a service request depending on the request content or context
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]

Abstract

The invention describes a method for transmitting data packets by a router, whereby the ports of the router are assigned to affinity values. The data packets also comprise affinity values. Depending on a match of the affinity values of the data packets and the affinity values of the ports, the router forwards the data packets to selected ports. Furthermore, the data of the payload of the data packets are attenuated depending on the affinity value that is used for selecting the port.

Claims

1. A method for transmitting a data packet by a router, wherein the router:

determines a receiver for the data packet;

checks an affinity value of the data packet;

attenuates a payload of the data packet depending on the affinity value of the data packet;

checks an affinity value assigned to the determined receiver; and

sends the attenuated data packet to the determined receiver, if the determined receiver shows the same affinity value as the data packet.

2. A method according to claim 1, whereby the router comprises a table in which affinity values of receivers are stored, whereby the router compares the affinity value of the data packet with the affinity values of determined receivers stored in the table and selects determined receivers that have the same affinity value as the data packet, and whereby the router sends the data packet to at least one of the selected receivers.

3. A method according to claim 1, whereby the router drops the data packet if no receiver shows the same affinity value.

4. A method according claim 1, whereby the router attenuates the data packet in two different ways, when a data packet comprises two affinity values and the router finds a first receiver that has the first affinity value and a second receiver that has the second affinity value, by creating a first and a second attenuated data packet, whereby the two attenuation methods are determined by the first and the second affinity value, and whereby the router sends the first attenuated data packet to the first receiver with the first affinity value and the second attenuated data packet to the second receiver with the second affinity value.

5. A method according claim 1, whereby, when a data packet comprises a first and a second affinity value, whereby the first affinity value determines a greater attenuation of the payload of the data packet than the second affinity value, the router attenuates the payload of the data packet according to the first affinity value and sends the attenuated data packet to the receiver showing the first affinity value.

6. A method according to claim 1, wherein the data packet comprises video and audio data, wherein the data packet comprises a first and a second affinity value, wherein the first affinity value determines only the audio data to be transmitted by the router and the second affinity value determines only the video data to be transmitted by the router.

7. A method according to claim 1, wherein the data packets are used for sharing information at the same time with several hosts.

8. A method according to claim 1, wherein the data packets are used for sending different information to different hosts that are used for playing a computer game with several players and that the affinity values are used for selecting different information for different players.

9. A method according to claim 7, wherein the affinity values are used for determining different levels of information, i.e. depending on different virtual locations the players are in.

10. A method according to claim 1, wherein a UDP checksum of the data packet is compared with a predetermined value and the data packet is recognized as an attenuable data packet if the UDP checksum equals the predetermined value, wherein the data packet comprises an AP checksum and the AP checksum is calculated to such a value to get an UDP checksum that is equal to the predetermined value if the data packet should be marked as an attenuable data packet.

11. In a network having a plurality of routers interconnected with each other, a program storage device readable by a digital processing apparatus and having a program of instructions which are tangibly embodied on the storage device and which are executable by at least one processing apparatus of said network to perform a method of transmitting a packet of data, said method comprising:

determining a receiver for said packet;

determining an affinity value for said packet;

attenuating a payload of said packet depending on its affinity value;

determining an affinity value assigned to said determined receiver; and

transmitting said attenuated packet to said receiver if said determined receiver has the same affinity value as said packet.

12. A network for transmitting a packet of data, said network comprising:

a plurality of receivers interconnected with each other; and

at least one program storage device readable by a digital processing apparatus and having a program of instructions which is tangibly embodied on the storage device and which is executable by at least one processing apparatus of said network to perform a method of transmitting a packet of data, said method comprising;

determining a receiver for said packet,

determining an affinity value for said packet,

attenuating a payload of said packet depending on its affinity value,

determining an affinity value assigned to said determined receiver, and

transmitting said attenuated packet to said receiver if said determined receiver has the same affinity value as said packet.

13. A network for transmitting a packet of data as recited in claim 12, wherein each receiver is one of the following:

a router and host.

14. A method for transmitting a data packet in a communications network, said method comprising:

determining a receiver for said packet;

determining an affinity value for said packet;

attenuating a payload of said packet depending on its affinity value;

determining an affinity value assigned to said determined receiver; and

transmitting said attenuated packet to said receiver if said determined receiver has the same affinity value as said packet.