DAD proxy daemon responsible for forwarding NS/NA between tethered iface and upstream iface. Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1258645 Merged-In: I3f1d7019f1a12647b78630a412df3adf03e9e95a Change-Id: I208bcd3f320afb2673ea0a1cbbccd5f32059fe8b