Thesis

Abstract: The data security can be enhanced by using IPSec/VPN policies. In this work the task of encryption are integrated to provide the higher level of security services. The work has focused on the tunnel technique to be the core of the proposed VPN. A tunnel is a way to transfer data that can be enclosed by the corresponding tunnel protocol (IPSec tunnel mode). Raw socket software programming interface has been implemented to send and receive IP datagrams throughput the network.

Fault-tolerance technology has become an important branch in computer systems, and is widely used in many other fields. Fault-tolerance schemes can be used to increase the Availability and Reliability of network service systems. This thesis implemented a Fault-Tolerance Web server system that supports software and hardware failure bypassing, depending on the Dual-Server Hot-Standby principle, where an efficient transparent fail-over scheme is used to provide fault-tolerant network service.