Neighbor Proxy Daemon IPv6
https://github.com/maxchendt/npd6/releases/download/1.1.2/npd6_1.1.2_amd64.deb
To build deb package
wget https://github.com/maxchendt/npd6/archive/1.1.2.tar.gz
tar -xvpzf 1.1.2.tar.gz
cd npd6-1.1.2/
sudo apt-get install --no-install-recommends debhelper build-essential
dpkg-buildpackage -b -us -uc -i
cd ..
sudo dpkg -i npd6_1.1.2_amd64.deb