Building IPv6 based tunneling mechanisms for VoIP security

Internet protocol version 6 (IPv6) was developed to resolve the IPv4 address exhaustion problem and support new features. However, IPv6 still comprises some defectiveness of IPv4 protocol such as multimedia security. This paper presents IPv6-based tunneling mechanisms for securing Voice over Internet Protocol (VoIP) network traffic using OpenSwan IPSec (site-to-site). IPSec with Triple Data Encryption Algorithm (3DES) is used to create a Virtual Private Network (VPN) on top of existing physical networks. Secure communication mechanisms can therefore be provided for data and control information transmitted between networks. Secure VoIP-oriented mechanisms on VPN IPv6 have been designed, implemented and tested successfully using open source approaches. The performance of the IPv6 VoIP network is assessed experimentally in terms of several performance metrics including jitter, throughput and packet loss rate. The obtained results revealed that the proposed IPv6-based tunneling mechanisms for VoIP have negligible impact on network performance when compared to the previously reported work in literature, with a slight increase in the price of CPU and memory resources.

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