现在我们需要配置本地网络接口。

Now we need to configure the local network interface.

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在理想情况下，可以确保只能通过本地网络接口访问本地应用程序。

Ideally, ensure that the local application is only accessible on the local network interface.

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设置或者清除套接字的SO_BROADCAST(广播)选项。当该设置生效时，UDP数据包将被发送至本地网络接口的广播地址。

Sets or clears the SO_BROADCAST socket option. When this option is set, UDP packets may be sent to a local interface's broadcast address.

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