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In VPN tunnelling mode, IPSec can be used to join multiple networks, each with their own private IPs into a single virtual network. However, you will need a gateway with public IP Address, so the sender knows how to route the encrypted packets to systems that are on a different physical network. In VPN mode, each packet have two destination addresses. ...


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Let's explain the two modes, how they differ, and clear the air: Tunnel mode: Protects internal routing information by encrypting the IP header of the original packet. The original packet is encapsulated by a another set of IP headers. Allows for NAT traversal Transport mode: Transport mode encrypts only the payload and ESP trailer NAT traversal is ...



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