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Understanding IPsec VPN Modes

The following two modes determine how traffic is exchanged in the VPN:

Tunnel mode is the most common VPN mode on the Internet because it easily allows entire networks (particularly those with private address space) to communicate over public IP networks. Transport mode is primarily used when encrypting traffic between two hosts to secure communication where IP address overlap is not an issue (for example, between a host and a server on a private network).

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