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Communication apparatus and communication method and computer readable medium

  • US 7,937,748 B2
  • Filed: 03/27/2006
  • Issued: 05/03/2011
  • Est. Priority Date: 04/27/2005
  • Status: Expired due to Fees
First Claim
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1. A communication apparatus, comprising:

  • a storage device to store security associations that are time-limited parameters regarding an IPsec secure communication, the security associations being exchanged between an opposite party'"'"'s communication apparatus, and being effective during prescribed lifetimes;

    an adjustment device configured to update the security associations stored in the storage device before starting a sleep mode for a power-saving operation, and to adjust the lifetimes for the updated security associations so that a longer time period is added to the lifetimes when it is determined based on a log of previous communications that the communication apparatus is rarely used, wherein the adjusted lifetimes for the updated security associations enable the communication apparatus to start communication immediately after a wake-up in the sleep mode; and

    a notification device configured to notify the lifetimes, adjusted by the adjustment device, to the opposite party'"'"'s communication apparatus to stop a transmission of a packet for communication management for a fixed time period in the opposite party'"'"'s communication apparatus, the packet including a dead peer detection (DPD) packet.

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