这种方法要复杂得多。它需要客户端与服务器都支持1.1协议，而且连接数量也存在可伸缩性的问题。

This approach is a lot more complex; it requires both the client and the server to support the 1.1 protocol, and it has scalability issues with the number of connections.

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注意，IPSec连接可以通过客户端计算机上的软件而不是专用ipsec路由器建立，但使用专用设备具有更高的可伸缩性。

Note that IPSec connections can be established using software on the client machine rather than using a dedicated IPSec router, but using dedicated equipment scales better.

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