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VPN works in two modes: tunnel and transport. When a packet enters the tunnel mode VPN-connection, the entire batch of data (TCP header and payload) is encrypted and given a new title, so the source package become part of the encrypted data, the new VPN-tunnel packet. беспроводной интернет utel .

In transport mode only encrypted data of the source package. Original headline TCP-packet becomes the new title and remains unencrypted. Transport mode is less secure than tunnel mode, because it uses the header information of the original packet, ie IP address of the sender and the recipient of two hosts remain open and all the data TCP-session remain in clear text in the header when transmitting packets through the satellite Internet channel. радио микрофоны .

Tunnel mode VPN has become the corporate standard of security. Completely hidden (through encryption), the original packet header data and the data itself, the package is impermeable for attacks to intercept it, which makes it impossible to rewrite and resubmit TCP-session and can be safely transmitted through the public Internet. polycom купить .

If the title of the original packet data is fully encrypted, no information can be obtained about the original TCP-session established between the client and the server. In transport mode only encrypts the original data, and the header remains unencrypted and can get under the curious eyes of the hacker. камера на шлем киев.

Transport mode VPN in today's global networks have a very rare, since it does not meet the criteria for company security.