ndc resolver flushdefaultif 和 ndc resolver flushif wlan0 需要 root

出自 How can I flush the DNS Cache?

Addresses are cached for 600 seconds (10 minutes) by default. Failed lookups are cached for 10 seconds.

出自 How can I flush the DNS Cache?

ndc (Native Daemon Connector)，为开发者提供了一个用于管理的接口

查询可用命令表 ndc interface list

留意一下 tether 命令

出自 Android Netd ndc (Native Daemon Connector)

ndc resolver flushif -- flushes old DNS servers
ndc resolver flushdefaultif -- flush resolver
ndc resolver setifdns <iface> <domains> <dns1> <dns2> ... -- Add the new servers
ndc resolver setdefaultif -- Set as the default device

出自 [Q][DNS] Set DNS on Android 4.3 and 4.4

回头再补充

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am start -n com.android.settings/com.android.settings.TestingSettings 需要 root

效果与拨号盘输入*#*#4636#*#*相同