Layer 3 source and destination addresses do not change when the packet traverse.
当储存器横过的时候，层3个来源和目的地住址不改变。
The SOCKS server will typically evaluate the request based on source and destination addresses, and return one or more reply messages, as appropriate for the request type.
Socks服务器将依据来源和目标地址代表性的检验请求，并且依照请求的方式返回一或多条回应信息。
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。
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