认证报头(AH)是直接添加到IP报头之后的附加报头，以提供包认证。
The authentication header (AH) is an additional header added directly after the IP header to provide packet authentication.
封装的安全有效载荷(esp)报头有能力提供加密和包认证功能。
The Encapsulated Security Payload (ESP) header has the ability to provide encryption as well as packet authentication.
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