Method of establishing an internet protocol network utilizing IP gateway that functions as either or both DHCP client and DHCP server

• US 6,560,642 B1
• Filed: 10/23/1999
• Issued: 05/06/2003
• Est. Priority Date: 10/26/1998
• Status: Expired due to Term

• Current Assignee: ELSA AG, LANCOM Systems GmbH (Rohde & Schwarz GmbH & Company KG)
• Original Assignee: ELSA AG
• Inventors: Nurmann, Jens
• Primary Examiner(s): EL HADY, NABIL M
• Application Number:
  US09/425,863
• Time in Patent Office: 1,291 Days
• Field of Search: 709/220-225
• US Class Current: 709/220
• CPC Class Codes: H04L 61/5014 using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
• 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 69/169 Special adaptations of TCP, UDP or IP for interworking of IP based networks with other networks protocols for interworking, protocol conversion H04L69/08

Abstract

This invention relates to a method of establishing an Internet Protocol network with several IP hosts and with an IP gateway for connecting the IP network to the Internet. The invention provides a method which no longer requires the knowledge of address mechanisms of the Internet protocol previously necessary for a successful establishment and thus protects disturbances of errors during the establishment of an Internet Protocol network.

Claims

1. A method of establishing an IP network with several IP hosts and with an IP gateway for connecting the IP network to the Internet, characterized in that:

An IP stack is installed in each IP host which stack can function as a DHCP client,

An IP stack is installed in the IP gateway which stack can function both as a DHCP client and as a DHCP server,

After having been activated, the IP gateway functions at first as a DHCP client and checks whether a DHCP server is present in the IP network, and

If no DHCP server is present in the IP network the DHCP server in the IP gateway activates itself and allocates IP addresses and IP network masks to each activated IP host from a reserved address range.

2. The method according to claim 1, characterized in that the IP address allocated to each IP host is routed onward to the Internet by means of known address translation technologies.

3. A method of establishing an IP network with several IP hosts and with an IP gateway for connecting the IP network to the Internet, characterized in that:

An IP stack is installed in each IP host which stack can function as a DHCP client,

An IP stack is installed in the IP gateway which stack can function both as a DHCP client and as a DHCP server,

After having been activated, the IP gateway functions at first as a DHCP client and checks whether a DHCP server is present in the IP network, and

If no DHCP server is present in the IP network the DHCP server in the IP gateway activates itself and allocates IP addresses and IP network masks to each activated IP host from a reserved address range and further characterized in that after the allocation of the IP addresses and IP network masks a program for configuring the Internet access is started on at least one IP host which program starts a broadcast call of the IP host to an address, reserved for the broadcast call, of the IP gateway functioning as DHCP server and that the configuration program allocates an IP address and an IP network mask from the reserved address range to the IP gateway under which the gateway can be detected if a non-configured IP gateway with active DHCP server is present at the reserved address.

4. The method according to claim 3, characterized in that the IP address allocated to each IP host is routed onward to the Internet by means of known address translation technologies.

5. An IP network capable of being connected to the Internet, comprising:

a) a plurality of IP host computers each having a first IP stack installed therein, wherein said first IP stack is capable of functioning as a DHCP client;

b) at least one IP gateway, having a second IP stack installed therein, wherein said second IP stack is capable of functioning as either or both a DHCP client and as a DHCP server,

wherein said IP gateway includes a means for determining whether a DHCP server is present in said network.

6. An IP network according to claim 5 wherein said IP gateway further includes a means for activating itself as DHCP server.

7. An IP network according to claim 5 wherein an IP gateway is functioning as DHCP server, and further comprising a means for allocating an IP address and an IP network mask to each IP host in said network.

8. An IP Network according to claim 7 wherein said IP address and said IP network mask are selected from a reserved address range.

9. A process for establishing an IP network comprising the steps of:

a) providing a plurality of IP hosts, wherein each IP host includes a first IP stack that is capable of functioning as a DHCP client;

b) providing an IP gateway connected to said hosts, wherein said gateway includes a second IP stack that is capable of functioning as either a DHCP client, or as a DHCP server;

c) causing said IP gateway to detect whether a DHCP server is present in said network;

d) causing said IP gateway to become active as a DHCP server in cases when no DHCP server is detected; and

e) causing said IP gateway to allocate IP addresses and IP network masks to each IP host in said network.

12. The process of claim 9 wherein the IP address allocated to said IP hosts is routed to the Internet by means of known address translation technologies.

10. A process for establishing an IP network comprising the steps of:

a) providing a plurality of IP hosts, wherein each IP host includes a first IP stack that is capable of functioning as a DHCP client;

b) providing an IP gateway connected to said hosts, wherein said gateway includes a second IP stack that is capable of functioning as either a DHCP client, or as a DHCP server;

c) causing said IP gateway to detect whether a DHCP server is present in said network;

d) causing said IP gateway to become active as a DHCP server in cases when no DHCP server is detected;

e) causing said IP gateway to allocate IP addresses and IP network masks to each IP host in said network; and

f) initiating a program for configuring Internet access on at least one IP host,

wherein said program starts a broadcast call of the IP host to an address, said address having been previously reserved for such a broadcast call, to an address of the IP gateway (when said IP gateway is functioning in its DHCP server capacity), and wherein said program allocates an IP address and an IP network mask from a reserved address range to the IP gateway through which a non-configured IP gateway may be detected when an active DHCP server is present at the reserved address.

11. The process of claim 10 wherein the IP address allocated to said IP hosts is routed to the Internet by means of known address translation technologies.