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NAT-T Overcomes NAT and IPsec Problems

NAT-T (IETF RFC 3947 and 3948) detects the presence of any NAT devices between two hosts, uses a non-IPsec port and encapsulates the IPsec traffic in UDP. NAT-T does this by inserting an additional header between the IP header and the ESP header. This header contains the original source and destination ports. (continue at source)

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