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。

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This means that routers strip off the Ethernet header upon reception of a packet, and then add a new lower layer header-ethernet or otherwise-when the packet is forwarded.

这意味着路由器在收到数据封包时就会去除以太网的数据头信息，加上低一层的数据头信息(以太网层或者其他层的)，然后发送给下一方。

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ESP protects the entire inner IP packet and header.

ESP保护整个内部的ip包和报头。

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