The new and extra header added in Transport mode means 20 extra bytes in overhead. In both Transport mode and Tunnel mode, either an Authentication Header (AH) or an Encapsulating Security Payload (ESP) header is added to the IP header. … Security and Tunneling Overhead. ProtocolHeader SizeIPsec Transport Mode30 to 37 bytesSecurity and Tunneling Overhead – ONT – Cisco Certified Expert www.ccexpert.us › ont › security-and-tunneling-overhead
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