When a site-to-site VPN is configured, IPsec tunnel mode with ESP (Encapsulating Security Payload) provides encapsulation and encryption of the entire original IP packet. In this mode, the entire IP packet, including the original IP header and payload, is encapsulated within a new IP packet with a new IP header added by the VPN gateway. The original packet is encrypted, ensuring confidentiality, and the new IP header allows the encrypted packet to be routed over the public internet securely to the other VPN gateway, where it is decrypted and forwarded to its final destination.
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