Android DNS search priority

code frameworks/base/core/java/android/net/MobileDataStateTracker.java

default code

mDnsPropNames = new String[] {
"net.rmnet0.dns1",
"net.rmnet0.dns2",
"net.eth0.dns1",
"net.eth0.dns2",
"net.eth0.dns3",
"net.eth0.dns4",
"net.gprs.dns1",
"net.gprs.dns2",
"net.ppp0.dns1",
"net.ppp0.dns2"};

}