目前的監視系統以漸漸從類比走向數位化, 而隨著網際網路的發展，無線以及寬頻網路的普及，這樣的發展也使得使用者端可以透過建置的網路，可無時無刻的連上監視系統，也就是說可以經由遠端而連接上監視系統；然而，以網路為媒介的網路攝影機，也有其叫人詬病的地方，就是其連線上網路可靠度的問題，也就是說對於一個IP-based的監視系統而言，網路的可靠度成為一個很重要的議題；當使用者遇到網路連線出現問題時，使用者將不能透過網路來存取網路攝影機，或備份伺服器上的資料。因此在本篇論文中，提出一個具有網路容錯以及負載平衡的監視系統。針點監視系統在網路容錯的方面，提出了兩階段的解決方式，並採用了multihome-based的方法來改善網路容錯的能力；並且延續了multihome-based的方法，來解決網路負載的問題，將網路的流量平均分攤到各個連線上，如此一來即能避免單一連線上擁塞的問題，使用者也能得到較好的觀看品質，而減少擁塞的情況。

Current video surveillance systems are becoming digitalized and IP-based. With the developments of Internet, wireless and broadband networks, it is possible for a surveillance system client to
ubiquitously access the surveillance system, i.e., to view the surveillance video and control the system remotely. However, one critical disadvantage of the IP-based surveillance is the network reliability problem. That is, since the IP-based surveillance system is IP-based, all of the services provided by the IP-based surveillance system will not be accessible at all if network failure occurs. In this paper, a network-fault-tolerable IP-based surveillance (NeTSurv) system is proposed. In addition to the existing features of current video surveillance systems, a multihome-based approach is adopted to improve the network fault tolerance capability of the NeTSurv system. Two-level fault
tolerance mechanisms are developed to solve the connectivity issue and the continuity issue of video playout for different link failure scenarios. Furthermore, a load balance mechanism is also devised for the NeTSurv system to distribute the load across multiple links.
Using the load balance mechanism, congestion of a single link can be prevented when multiple clients request surveillance video through
Internet at the same time.

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[16] Iperf
http://dast.nlanr.net/Projects/Iperf/.

[17] ietimeout
http://www.simplefailover.com/outbox/ietimeout-se.exe.