在隧道模式，内部的ip报头承载预设的源和最初的目的地址，外部ip报头包含用于跳点的IP地址，比如安全网关。
In tunnel mode, the inner IP header carries the intended source and original destination addresses, while an outer IP header contains IP addresses for hop points such as security gateways.
在隧道模式，内部的ip报头承载预设的源和最初的目的地址，外部ip报头包含用于跳点的IP地址，比如安全网关。
In tunnel mode, the inner IP header carries the intended source and original destination addresses, while an outer IP header contains IP addresses for hop points such as security gateways.
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