INFORMATION PROCESSING SYSTEM, PROXY SERVER, ADDRESS DUPLICATION PREVENTION METHOD, AND COMPUTER-READABLE RECORDING MEDIUM
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United States of America Patent
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app pub date -
Mar 2, 2016
filing date -
Mar 2, 2015
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Abstract
Provided is an information processing system capable of preventing duplicate allocation of an IP address. The information processing system includes: a DHCP server connected to a first subnet and configured to transmit, in response to a request for address allocation from a client terminal, a request message for confirming a use state of a target address, to a second subnet, and determine, upon receiving a response message including a confirmation result for the request message from the second subnet, whether or not to allocate the address to the client terminal, based on the confirmation result; and a proxy server connected to the second subnet and configured to send, upon receiving the request message from the DHCP server, an echo request for requesting a client terminal using the target address in the request message to send a reply, to a subnet to which the client terminal having requested the address allocation is connected, and transmit, to the DHCP server, the response message including presence or absence of a response to the echo request as the confirmation result.
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