But the TCP/IP protocol used on the Internet adds another “Overhead”, so in practice, the measurements have shown that a 1 Gbit fastened server reaches approx. When you are surfing on the Internet over a CyberGhost server, you are not the only one using this, which means that this server must receive a lot of packets, to encrypt/decrypt and forward.Ī server on which are connected for example 50 persons and each of them wants to download with 50 Mbit/s, must be able to handle at least 2,4 Gbit/s user data. Through the encryption, this lasts even longer, depending on the processor load of the PC. ![]() So when using a VPN, more data must be transmitted. ![]() The size of the data packets depends among others on the following aspects: over which servers are these sent and which packets size does the remote station accepts (MTU).Īt the measurement of speed tests with an active VPN connection is measured only how many user data can be transmitted over a period of time, therefore the above-mentioned Overhead is not measured. If 1 MB file is sent into 2097 packets, then 2097*50 Byte additional data (Overhead) must be transmitted, so 123723 Byte. For example, at CyberGhost (via OpenVPN) this takes approximately 50 bytes per packet (it varies depending on the setting for encryption, authentication, etc.).įor example, a 1 MB file which is sent into 874 packets has 874*50 Byte additional data (Overhead), which must be transmitted, so 43700 Byte. This so-called “Overhead” is proportionally bigger, the more small packages are sent since the control information has a fixed size regardless of the size of the original packets. This is a complex and computationally intensive step.Īfter the encryption, more control information is set before the data (Header), so due to additional information, every packet is bigger as it originally was. These data packets are then encrypted with AES-256 bit. When using a VPN connection, all data is divided into packets before being sent.
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