Secure relay device and data transmission reception system

A secure relay device connected to a terminal device, the secure relay device configuring a termination point of a transport layer security (TLS) tunnel in a virtual private network (VPN) network performing data communication using a TLS tunnel, the secure relay device being configured to:

• determine whether a destination internet protocol (IP) address of reception data, which is received from a local area network (LAN), is same as an IP address of the LAN for determining a destination TLS tunnel to which the reception data is to be transmitted;
• when the reception data is destined to a different network address from the IP address of the LAN, execute a first process of selecting, as the destination TLS tunnel, the TLS tunnel established between a termination point corresponding to the different network address and a transmission source of the reception data;
• and
• when the reception data is destined to a same network address as the IP address of the LAN, execute a second process of selecting, as the destination TLS tunnel, the TLS tunnel established between a termination point corresponding to a destination media access control (MAC) addresses of the reception data and the transmission source of the reception data.