Abstract: VoIP technology is a technology that allows long-distance voice communication by utilizing internet media. Communication between users through the internet requires a level of security that are confidential (private). However, using an open internet network requires a communication data security method with the implementation of network performance and security. This can be done with the application of the Virtual Private Network (VPN) method. VPN applications on VoIP are affected by the security system by encrypting data from VoIP communications. VPN PPTP computer network security technology in virtual private IP or as a tunnel as a secure data transmission medium. The PPTP VPN and L2TP/IPsec VPN methods are a Layer 2 (Layer 2 Tunnel Protocol) – L2TP protocol, while the PPTP protocol uses only IP addresses, usernames and passwords for authentication. L2TP uses an additional authentication system, namely a Pre-shared key or secret. The purpose of this study is to compare security based on the protocol used with sniffing techniques and to obtain the Quality of Service (QOS) parameter values that includes bandwidth and delay. Performance test for bandwidth from the largest upload side, when using L2TP/IPsec VPN The average bandwidth value when uploading the G.711 codec is 76kbit/sec. While the download is around 77kbit/sec.

Keywords: VoIP, VPN PPTP, VPN L2TP/IPsec, QoS

| DOI: 10.17148/IARJSET.2022.9809