/usr/lib/libns3.17-propagation.so is in libns3-dev 3.17+dfsg-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libns3.17-propagation.so.0.0.0
/usr/lib/libns3.17-propagation.so.0.0.0