... VPN 架构㆗，相当重要的㆒个因素；这 些相关的技术包括通道(Tunneling) 、加密 (Encryption)、封包认证(Packet Authentication)、 防 ㈫ 墙 (Firewall) 、 使 用 者 认 证 (User Authentication) 及 入 侵 侦 防 系 统 (Intrusion Detection)，分述如㆘： 1.
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packet source authentication 分组数据源鉴别
The authentication header (AH) is an additional header added directly after the IP header to provide packet authentication.
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 Encapsulated Security Payload (ESP) header has the ability to provide encryption as well as 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。
Authentication at the packet level allows users to be sure that the packet received came from a particular machine, and that its contents were not altered somewhere along the way.
包级别的认证让用户可以确保收到的包来自于特定的机器，并且它的内容在传输路径上没有被改变。
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