My system android 7.1.2

It is like this:
Using a dynamic IP (DHCP), test equipment under the condition of network storm for IP,
After the storm, the equipment without sending DHCP discover package, lead to can not automatically obtain the IP, () I don't know what's
Secondly, in the closed and open the equipment switch Ethernet network, through the adb shell using the command ifconfig, can see has access to the IP, but the application layer does not show get to IP, or shown in the "get", but also on the net,
And not delay problem, because to put a period of time or in this way,

Do you have a great god a little familiar with the network system in android? Thank you for the