Apparatus and methods for use therein for an ISDN LAN modem utilizing internal DNS and DHCP servers for transparent translation of local host names to IP addresses

• US 6,028,848 A
• Filed: 09/26/1997
• Issued: 02/22/2000
• Est. Priority Date: 09/26/1997
• Status: Expired due to Term

• Current Assignee: Hewlett Packard Enterprise Development LP (Hewlett-Packard Enterprise Company)
• Original Assignee: 3Com Corporation (HP Inc.)
• Inventors: Elhindi, Tayseer M., Zhang, Siuling C., Bhatia, Rajiv
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US08/938,373
• Time in Patent Office: 879 Days
• Field of Search: 370/254, 370/255, 370/257, 370/401, 370/402, 370/475
• US Class Current: 370/257
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04M 11/06 Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
• CPC Class Codes: H04Q 11/0471 Terminal access circuits

Abstract

Apparatus, and accompanying methods for use therein, for an ISDN LAN modem (300) (and various aspects thereof) that is particularly, though not exclusively, suited for small user environments and which contains an internal ISDN router (305) having a self-contained network hub (340) for inter-connecting multiple network devices, such as workstations (10), to each other through a local area network (LAN) and for permitting each of those devices to each gain access through the router to any one of a number of different remote networks. Advantageously, to facilitate and simplify its configuration, the LAN modem automatically adapts itself to a current network environment of a workstation connected thereto, via the LAN, and then communicates with that workstation through a browser executing thereat to obtain configuration information from a user situated at the workstation. Additionally, the LAN modem, through use of a multi-tiered routing hierarchy including both destination- and source-based routing, accommodates several modalities of network communication not heretofore possible in a conventional router. Specifically, several different workstations can simultaneously communicate through the LAN modem with a common remote network (60) and share a single user account at a corresponding network service provider.

Claims

1. Apparatus for a network communication device comprising:

a processor;

a memory, connected to the processor, for storing executable instructions therein;

communication circuitry, connected to and controlled by the processor, for establishing a communicative connection between a first network and, via a second network, to at least one host device connected to the second network; and

a shared database residing in the memory and containing a host list having at least one host entry wherein the entry stores an corresponding internet protocol (IP) address for use by the one host device;

wherein, in response to the executable instructions, the processor;

implements domain name service (DNS) and dynamic host control protocol (DHCP) servers;

in response to a DHCP request message received over the second network from the one host device, the message requesting an IP address for the host device from the DHCP server, wherein the DHCP request message identifies the one host device by its associated machine name and physical network address, defines in the entry the machine name of the one host and its corresponding physical network address so as to associate the one host device with the corresponding IP address stored in the entry, such that the DNS server can subsequently access the entry in order to translate the machine name of the one host device as supplied in a network message over the second network into the corresponding IP address so as to permit the one host device to be addressed via the machine name by any device then connected to the second network; and

provides a DHCP response message over the second network to the one host device wherein the response message contains the corresponding IP address stored in the entry for subsequent use by the one host device.

2. The apparatus in claim 1 wherein the first and second networks comprise a remote network and a local area network, respectively.

3. The apparatus in claim 2 wherein the physical network address comprises an Ethernet address.

4. The apparatus in claim 3 wherein the processor, in response to the stored instructions, replaces a default Ethernet address and a default machine name in the host entry associated with the one host device with the Ethernet address and the machine name specified in the DHCP request message.

5. The apparatus in claim 4 wherein the processor, in response to the stored instructions, replaces, if the Ethernet address specified in the DHCP request message matches an Ethernet address then stored in the host entry, a machine name then stored in the host entry with the machine name provided in the DHCP request message.

6. The apparatus in claim 5 wherein the host list comprises a number of separate host entries, each of said entries having a different IP address stored therein so as to define a plurality of different IP addresses.

7. The apparatus in claim 6 wherein each IP address in each of the host entries is pre-defined and, once assigned to a particular one of the host devices, remains fixed for as long as the one particular host device undertakes network communication through the local area network.

8. The apparatus in claim 7 wherein each one of the plurality of IP addresses is a private IP address.

9. The apparatus in claim 7 wherein the number of separate entries is equivalent to a number of separate host devices permitted to use the local area network at any one time.

10. The apparatus in claim 9 wherein the number of separate entries in the host list is at least four.

11. The apparatus in claim 6 wherein the number of separate entries is equivalent to a number of separate host devices permitted to use the local area network at any one time.

12. The apparatus in claim 11 wherein the number of separate entries in the host list is at least four.

13. The apparatus in claim 11 wherein each one of the plurality of IP addresses is a private IP address.

14. The apparatus in claim 13 wherein the number of separate entries in the host list is at least four.

15. A method for use in a network communication device, the device having a processor, a memory, connected to the processor, for storing executable instructions therein, communication circuitry, connected to and controlled by the processor, for establishing a communicative connection between a first network and, via a second network, to at least one host device connected to the second network, and a shared database residing in the memory and containing a host list having at least one host entry wherein the entry stores an corresponding internet protocol (IP) address for use by the one host device;

wherein the method comprises the steps, implemented through the executable instructions, of;

implementing domain name service (DNS) and dynamic host control protocol (DHCP) servers;

in response to a DHCP request message received over the second network from the one host device, the message requesting an IP address for the host device from the DHCP server, wherein the DHCP request message identifies the one host device by its associated machine name and physical network address, defining in the entry the machine name of the one host and its corresponding physical network address so as to associate the one host device with the corresponding IP address stored in the entry, such that the DNS server can subsequently access the entry in order to translate the machine name of the one host device as supplied in a network message over the second network into the corresponding IP address so as to permit the one host device to be addressed via the machine name by any device then connected to the second network; and

providing a DHCP response message over the second network to the one host device wherein the response message contains the corresponding IP address stored in the entry for subsequent use by the one host device.

16. The method in claim 15 wherein the first and second networks comprise a remote network and a local area network (LAN), respectively.

17. The method in claim 16 wherein the physical network address comprises an Ethernet address.

18. The method in claim 17 wherein the defining step comprises the step of replacing a default Ethernet address and a default machine name in the host entry associated with the one host device with the Ethernet address and the machine name specified in the DHCP request message.

19. The method in claim 18 wherein the defining step further comprises the step of replacing, if the Ethernet address specified in the DHCP request message matches an Ethernet address then stored in the host entry, a machine name then stored in the host entry with the machine name provided in the DHCP request message.

20. The method in claim 19 wherein the host list comprises a number of separate host entries, each of said entries having a different IP address stored therein so as to define a plurality of different IP addresses.

21. The method in claim 20 wherein each IP address in each of the host entries is pre-defined and, once assigned to a particular one of the host devices, remains fixed for as long as the one particular host device undertakes network communication through the local area network.

22. The method in claim 21 wherein each one of the plurality of IP addresses is a private IP address.

23. The method in claim 21 wherein the number of separate entries is equivalent to a number of separate host devices permitted to use the local area network at any one time.

24. The method in claim 23 wherein the number of separate entries in the host list is at least four.

25. The method in claim 20 wherein the number of separate entries is equivalent to a number of separate host devices permitted to use the local area network at any one time.

26. The method in claim 25 wherein the number of separate entries in the host list is at least four.

27. The method in claim 25 wherein each one of the plurality of IP addresses is a private IP address.

28. The method in claim 27 wherein the number of separate entries in the host list is at least four.