can not call client behind secondary router of wlan

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What steps will reproduce the problem?
1. client A is behind a secondary router, while B is connected to the first 
level router; 


What is the expected output? What do you see instead?
A can connect to B, while B fail to connect to A


What version of the product are you using? On what operating system?
product version: 
    android:versionCode="581"
    android:versionName="2.581.1247"
nexus five

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 27 Mar 2015 at 8:02