DNS 隧道这类通道还有一个特点：单次查询几乎不产生可观测的业务影响，所以你很难用传统的错误率或延迟指标把它捞出来。它只能靠出网面的收敛程度来防，不能靠检测来兜。把出口收成一条、把开关从监控链路里摘出来、把演练做成例行，这三件事做完，剩下的就是时间问题。

下午三点，A股收盘，五千多只股票的K线定格。散户们打开行情软件，翻K线、比形态、盯成交量，想从五千多个候选里挑出明天值得多看一眼的几只。但翻完五百只，剩下的四千五百只只能靠缘分。人脑天生不擅长处理海量信息，更不擅长在疲惫时保持纪律，而选股恰恰两样都占。

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