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Graceful Dynamic Host Configuration Protocol

IP.com Disclosure Number: IPCOM000206303D
Publication Date: 2011-Apr-19
Document File: 3 page(s) / 50K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a novel connection protocol, named Graceful Dynamic Host Configuration Protocol, to enable DHCP client obtain new IP address without intermitting the service or connection during the period of network environment being reboot.

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Graceful Dynamic Host Configuration Protocol

1. Background: The Dynamic Host Configuration Protocol (DHCP) is an auto-configuration protocol for computers to acquire IP address automatically. In particular situations, the computers that has static IP address will modify its network settings to DHCP. Then, the network interface will be restarted when acquiring new IP address from the DHCP Server. However, the computers do not have a chance to inform others of the new IP address before restarting its network interface. Therefore, the connected communication channel between the computers, which obtain new IP address via DHCP, and other computers will be lost after network settings restart.

    The prominent advantage of this invention lies in that the connections between the computer, which obtain new IP address via graceful DHCP, and its communication peers/clients will be kept gracefully. With this invention, the service/connection will continue without interruption during the period of network settings reboot. As a result, the availability of the whole service/system will be increased; on the contrary, the risk of instability can be reduced to an acceptable level.

Original DHCP client will have several steps as illustrated in figure 1.

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Figure 1. State-transition diagram for original DHCP clients

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        Figure 2. State-transition diagram for graceful DHCP clients
Figure 2 depicts the state-transition diagram for Graceful DHCP clients. A client can receive the DHCPOFFER and DHCPACK messages from server, and the Notification Signal from external application or host operating system. The state descriptions are as follows:
1) INIT : Initially, the graceful DHCP client is in INIT state. When the client sends a DHCPDISCOVER message to DHCP servers, it will transit to the SELECTING state. The graceful DHCP client behave the same as original DHCP client in the INIT state.
2) SELECTING : When the gra...