KIPS Transactions on Computer and Communication Systems (정보처리학회논문지:컴퓨터 및 통신 시스템)

Korea Information Processing Society (한국정보처리학회)
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TCP Session Recovery Technique for High Availability in Smart On-Devices

스마트 온디바이스의 고가용성을 위한 TCP 세션 복구 기술

  • Received : 2016.12.23
  • Accepted : 2017.02.17
  • Published : 2017.06.30
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Abstract

With the development of smart on-devices and communication technology, demand for non-stop services is increasing. Therefore, the high availability for continuously providing services in the event of system failure has been spotlighted. Meanwhile, because most internet-based services are provided by using TCP, an efficient TCP session recovery technique for providing non-stop services is required. However, the existing TCP session recovery techniques are inefficient because it has a high recovery cost or does not support failover operation, To solve these problems, in this paper, we propose a TCP session recovery technique for high availability in smart on-devices. For this, we first recover the TCP session without re-establish the TCP session by correcting a sequence number and a acknowledgment number. Second, we synchronize the TCP session recovery data between the master and the server, and then we operate the failover operation when master server fails. Finally, we provide the non-stop service to peer by using the virtual IP number and the transmission of GARP (Gratuitous ARP) packet.

최근 스마트 온디바이스 및 정보 통신 기술의 발전으로 인하여, 중단 없는 서비스에 대한 요구가 점차 증가하고 있다. 이에 따라 시스템의 장애 발생 시에도 지속적으로 서비스를 제공할 수 있는 고가용성이 주목받고 있다. 한편, 대부분의 인터넷 서비스는 TCP를 기반으로 제공되기 때문에, 스마트 온디바이스의 고가용성을 위해서는 효율적인 TCP 세션 복구 기술이 필수적이다. 그러나 기존 TCP 세션 복구 기술은 높은 세션 복구비용이 요구되거나 페일오버를 지원하지 않는 문제점이 존재한다. 이러한 문제점을 해결하기 위해, 본 논문에서는 스마트 온디바이스의 고가용성을 위한 TCP 세션 복구 기술을 제안한다. 이를 위해 첫째, 순서 번호와 확인 응답 번호의 보정을 통해 TCP 세션의 재연결 과정 없이 TCP 세션을 복원한다. 둘째, 마스터 서버와 백업 서버 간에 TCP 세션 복구 데이터를 동기화하고, 마스터 서버의 장애 발생 시 페일오버를 수행한다. 마지막으로, 가상 IP 주소와 GARP (Gratuitous ARP) 패킷의 전송을 통해 피어에게 무중단 서비스를 제공한다.

Keywords

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