Patent Application
20050243801
The present invention relates to digital data networks. More specifically, the present invention relates to data priority, routing, and forwarding in a digital data network.
Broadband services amongst small businesses and home consumers are increasing at a rapid pace. Consistent with this trend is the proliferation of broadband devices which increase end users' capabilities and functionalities, e.g., voice over Internet Protocol (“VOIP”) devices.
With the availability of these expanded functionality devices comes complexity in terms of consumer integration of such devices into an already existing network, as the average consumer knows little about configuring a new device for an existing network. Thus, to date, new broadband device dissemination usually requires an extensive support staff (help desk) to assist end users in integrating these new devices into their network, as well as ensuring that previously existing network devices function as they did prior to the new addition.
This problem is exacerbated by the inclusion of a Dynamic Host Configuration Protocol (“DHCP”) server in new broadband devices. A DHCP server is typically included in new broadband devices as to provide any necessary routing; the assumption being that most homes simply have one personal computer (“PC”) connect to broadband gateway. A broadband device containing a DHCP server is typically referred to as a Network Address Translation Device or “NAT” device. The insertion of a NAT device (inserted to be directly connected to the gateway) into even a single PC environment places that single PC, which previously had a wide area network (“WAN”) addressable Internet Protocol (“IP”) address, outside the direct view of the WAN because the NAT device would have leased (given) the PC a private address upon request. Thus, for example, if the single PC was being used as a web server, such functionality would be inoperable after the insertion of the NAT device. Currently, the only way to resolve the above presented common scenario is for the end user to manually configure the newly inserted NAT device by means of port forwarding to the PC, for example. As many consumers are not network professional, this often results in complexity and frustration. Further, vendors of such NAT devices will most likely be required to provide some type of telephone or Internet help desk function to assist consumers in the above recited manual port forwarding configuration.
Another common scenario exists when a previously (“first”) NAT device already exists in the network and a new (“second”) NAT device is inserted between the broadband gateway and the first NAT device. Here, the second NAT device's inclusion would render the first NAT device, as well as all devices connected thereto, inoperable because the first NAT device would be invisible to the WAN. (A common reason as to why it be desirable to insert such a second NAT device in between the gateway and first NAT device is for bandwidth purposes. A VOIP NAT device is an example of such a second NAT device where this placement would be desirable.) Currently, the only way to resolve the above presented common scenario is to manually configure the second NAT device to port forward to the first NAT device. Again, as many consumers are not network professionals, this procedure often results in complexity and frustration. Further, again, vendors of such NAT devices will most likely be required to provide some type of telephone or Internet help desk function to assist consumers in the above recited manual port forwarding configuration.
What is needed is a device and method to easy the confusion and complexity of adding a new NAT device to a pre-existing network configuration.
An object of the present invention is to provide for automatic port forwarding by a NAT device, when such NAT device is introduced into a previously existing network.
In order to achieve this objective, as well as others which will become apparent in the disclosure below, the present invention provides for an inventive NAT device and method for automatic port forwarding whenever said inventive NAT device detects that only one local area network (“LAN” or “private”) IP address has been leased from its DHCP server. Under this condition, the inventive NAT device automatically configures all ports to be forwarded (except those that may be reserved for applications running in the NAT device), to the one leased LAN IP address. This minimizes, if not eliminates, the traditional address configuration required when a NAT device is added to an existing network.
In accordance with a first exemplary embodiment of the present invention, when said inventive NAT device is inserted between a gateway device and a single PC (previously directly connected the gateway device) and only one private address has been leased by the inventive NAT's DHCP server, the method causes the inventive NAT device to forward all ports, except those reserved for the inventive NAT's application(s), e.g., VOIP applications when the NAT is a VOIP device, to the single PC.
In accordance with a second exemplary embodiment of the present invention, where an inventive (“second”) NAT device is inserted into a network which already had a previously existing conventional (“first”) NAT device, between the gateway and the first NAT device, and only one LAN IP address has been leased by the inventive NAT's DHCP server, the method cause the inventive NAT device to forward all ports, except those reserved for the inventive NAT's application(s), e.g., VOIP application when the NAT is a VOIP device, to the first NAT device.
Thus, the inventive NAT device and method of the present invention provides for automatic port forwarding whenever the inventive NAT device detects that only one LAN IP address has been leased by its DHCP server. This minimizes, or eliminates, the need for a consumer to configure a NAT device for port forwarding.
For a complete understanding of the present invention and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying drawings in which like reference numbers indicate like features, components and method steps, and wherein:
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Thus, the inventive method of the present invention provides for automatic port forwarding by a NAT device whenever the NAT device detects that only one LAN IP address has been leased by its DHCP server. This minimizes, or eliminates, the need for a consumer to configure the NAT device for port forwarding.
Although the invention has been described herein by reference to an exemplary embodiment thereof, it will be understood that such embodiment is susceptible of modification and variation without departing from the inventive concepts disclosed. For example, the inventive NAT device 106 can perform automatic port forwarding whenever it leases (gives out) only one LAN/private address, regardless of whether the recipient of such private address is a single PC, or a single previously existing NAT device or router. All such modifications and variations, therefore, are intended to be encompassed within the spirit and scope of the appended claims.
