S or — source: This source match is used to match packets based on their source IP address.

s或——source：该源匹配用于根据信息包的源ip地址来与它们匹配。

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The large number of attacking machines and the use of source IP address spoofing make the traceback impossible.

大量的攻击机器且使用源地址欺骗使得现有的跟踪是不可能的。

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You can also set policies that control access to our SQS queue based on date, time, and source IP Address, as in Listing 2.

您还可以设置一个策略，它根据日期、时间和源ip地址控制SQS队列的访问，如清单2所示。

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