System for dynamically determining a network media type of a LAN using frame type identifying value from a configuration table

• US 5,758,070 A
• Filed: 10/06/1995
• Issued: 05/26/1998
• Est. Priority Date: 10/06/1995
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Lawrence, Thomas D.
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): LUU, LE HIEN
• Application Number:
  US08/540,138
• Time in Patent Office: 963 Days
• Field of Search: 395/183.15, 395/280, 395/500, 395/828, 395/250, 395/200.5, 395/200.54, 395/200.8, 395/200.81, 395/200.82, 395/200.83, 395/836, 370/94.1, 370/60, 370/389, 370/392
• US Class Current: 709/220
• CPC Class Codes: H04L 69/18 Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A method for dynamically determining a media type of a LAN to which a network device is connected, includes executing at least one network interface driver which supports a predefined network media type, and which has one or more configuration tables and one or more logical boards for processing communication packets having different frame types. Each configuration table is associated with one of the boards, which each includes a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding board. A multiplexer software module is executed, which interfaces between the network interface driver and one or more protocol stacks, and which routes packets from the network interface driver to respective protocol stacks. An executed protocol stack obtains an entry point of a network interface driver service routine via the multiplexer software module, obtains a location for one of the configuration tables via the service routine, reads the frame type identifying value in the one configuration table, and determines the network media type of the network interface driver by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

Claims

1. A method for dynamically determining a media type of a local area network (LAN) to which a network device is connected, said method comprising the steps of:

executing at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the LAN and handles the sending and receiving of communication packets to and from the LAN by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types and has one or more configuration tables, each respectively associated with one of the logical boards, which each include a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, and wherein the network interface driver software module has a service routine accessible via an entry point;

executing a multiplexer software module which interfaces between the network interface driver software module and one or more protocol stack modules, and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

executing the one or more protocol stack modules for processing packets that use different respective protocols, wherein a protocol stack module;

obtains the entry point of the network interface driver service routine via the multiplexer software module;

obtains a location for one of the configuration tables via the service routine;

reads the frame type identifying value in the one configuration table; and

determines the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

2. A method according to claim 1, wherein the network interface driver software module has an 802.3 logical board that processes packets having an 802.3 frame type and the corresponding configuration table has an identifying value of 5 for an Ethernet media type and an identifying value of 4 for a token ring media type, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for the 802.3 logical board and comparing the identifying value that is read to the value 5.

3. A method according to claim 1, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to the protocol stack modules, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to an Ethernet media type.

4. A method according to claim 1, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to the protocol stack modules, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to a token ring media type.

5. A network interface device which interfaces with a local area network (LAN) and which dynamically determines a media type of the LAN to which the network device is interfaced, said network interface device comprising:

a storage device that stores (i) at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the LAN and handles sending and receiving of communication packets to and from the LAN by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types, and wherein the network interface driver software module has a configuration table for each of the one or more logical boards and each configuration table includes a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, (ii) one or more protocol stack modules for processing packets that use different respective protocols, and (iii) a multiplexer software module which interfaces between the network interface driver software module and the one or more protocol stack modules and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

a processor that executes the network interface driver software module, the multiplexer software module, and the one or more protocol stack modules, wherein upon execution, a protocol stack module reads the frame type identifying value in one of the configuration tables, and determines the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

6. A network interface device according to claim 5, wherein the network interface driver software module has an 802.3 logical board that processes packets having an 802.3 frame type and the corresponding configuration table has an identifying value of 5 for an Ethernet media type and an identifying value of 4 for a token ring media type, and wherein said protocol stack determines the media type by reading the identifying value from the configuration table for the 802.3 logical board and comparing the identifying value that is read to the value 5.

7. A network interface device according to claim 5, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to said processor, and wherein said protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to an Ethernet media type.

8. A network interface device according to claim 5, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to said processor, and wherein said protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to a token ring media type.

9. Computer-executable process steps stored on a computer-readable medium, the computer executable process steps to dynamically determine a media type of a local area network (LAN) to which a network device is connected, said computer-executable process steps comprising:

code to execute at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the LAN and handles the sending and receiving of communication packets to and from the LAN by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types and has one or more configuration tables, each respectively associated with one of the logical boards, which each include a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, and wherein the network interface driver software module has a service routine accessible via an entry point;

code to execute a multiplexer software module which interfaces between the network interface driver software module and one or more protocol stack modules, and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

code to execute the one or more protocol stack modules for processing packets that use different respective protocols, wherein said protocol stack module includes;

code to obtain the entry point of the network interface driver service routine via the multiplexer software module;

code to obtain a location for one of the configuration tables via the service routine;

code to read the frame type identifying value in the one configuration table; and

code to determine the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

10. Computer-executable process steps according to claim 9, wherein the network interface driver software module has an 802.3 logical board that processes packets having an 802.3 frame type and the corresponding configuration table has an identifying value of 5 for an Ethernet media type and an identifying value of 4 for a token ring media type, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for the 802.3 logical board and comparing the identifying value that is read to the value 5.

11. Computer-executable process steps according to claim 9, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to the protocol stack modules, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to an Ethernet media type.

12. Computer-executable process steps according to claim 9, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to the protocol stack modules, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to a token ring media type.

13. A computer-readable medium which stores computer-executable process steps, the computer-executable process steps to dynamically determine a media type of a local area network (LAN) to which a network device is connected, the computer-executable process steps comprising:

a first executing step to execute at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the LAN and handles the sending and receiving of communication packets to and from the LAN by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types and has one or more configuration tables, each respectively associated with one of the logical boards, which each include a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, and wherein the network interface driver software module has a service routine accessible via an entry point;

a second executing step to execute a multiplexer software module which interfaces between the network interface driver software module and one or more protocol stack modules, and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

a third executing step to execute the one or more protocol stack modules for processing packets that use different respective protocols, wherein said protocol stack module;

obtains the entry point of the network interface driver service routine via the multiplexer software module;

obtains a location for one of the configuration tables via the service routine;

reads the frame type identifying value in the one configuration table; and

determines the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

14. A computer-readable medium according to claim 13, wherein the network interface driver software module has an 802.3 logical board that processes packets having an 802.3 frame type and the corresponding configuration table has an identifying value of 5 for an Ethernet media type and an identifying value of 4 for a token ring media type, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for the 802.3 logical board and comparing the identifying value that is read to the value 5.

15. A computer-readable medium according to claim 13, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to the protocol stack modules, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to an Ethernet media type.

16. A computer-readable medium according to claim 13, wherein the arrangement of logical boards for different frame types in the network interface driver software module is unknown to the protocol stack modules, and wherein a protocol stack determines the media type by reading the identifying value from the configuration table for one logical board and comparing the identifying value that is read to each possible value corresponding to a token ring media type.

17. An information processing apparatus having a computer and a network interface device which interfaces to the computer via a network and which dynamically determines a media type of the network, wherein the network interface device comprises:

a storage device that stores (i) at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the network and handles sending and receiving of communication packets to and from the network by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types, and wherein the network interface driver software module has a configuration table for each of the one or more logical boards and each configuration table includes a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, (ii) one or more protocol stack modules for processing packets that use different respective protocols, and (iii) a multiplexer software module which interfaces between the network interface driver software module and the one or more protocol stack modules and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

a processor that executes the network interface driver software module, the multiplexer software module, and the one or more protocol stack modules, wherein upon execution, a protocol stack module reads the frame type identifying value in one of the configuration tables, and determines the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

18. A display system having a display apparatus and a network interface device which interfaces to the display apparatus via a network and which dynamically determines a media type of the network, wherein the network interface device comprises:

a storage device that stores (i) at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the network and handles sending and receiving of communication packets to and from the network by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types, and wherein the network interface driver software module has a configuration table for each of the one or more logical boards and each configuration table includes a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, (ii) one or more protocol stack modules for processing packets that use different respective protocols, and (iii) a multiplexer software module which interfaces between the network interface driver software module and the one or more protocol stack modules and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

a processor that executes the network interface driver software module, the multiplexer software module, and the one or more protocol stack modules, wherein upon execution, a protocol stack module reads the frame type identifying value in one of the configuration tables, and determines the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.

19. A printing system having a printer and a network interface device which interfaces to the printer via a network and which dynamically determines a media type of the network, wherein the network interface device comprises:

a storage device that stores (i) at least one network interface driver software module, the network interface driver software module supporting a predefined network media type, wherein the network interface driver software module is the lowest level of software to communicate with the network and handles sending and receiving of communication packets to and from the network by appending or stripping off packet frame headers, wherein the network interface driver software module has one or more logical boards for processing communication packets having different respective frame types, and wherein the network interface driver software module has a configuration table for each of the one or more logical boards and each configuration table includes a frame type identifying value that identifies a combination of frame type and media type for packets processed by the corresponding logical board, (ii) one or more protocol stack modules for processing packets that use different respective protocols, and (iii) a multiplexer software module which interfaces between the network interface driver software module and the one or more protocol stack modules and which routes packets from the network interface driver software module to respective protocol stack modules according to the protocol used by the packets; and

a processor that executes the network interface driver software module, the multiplexer software module, and the one or more protocol stack modules, wherein upon execution, a protocol stack module reads the frame type identifying value in one of the configuration tables, and determines the network media type from the network interface driver software module by comparing the frame type identifying value read from the one configuration table to one or more values that correspond to a predetermined media type.