This project has been closed. Ale4NET used LD_PRELOAD to create a user level networking environment.
Ale4NET ideas converged into the View-OS project: umviewos uses ptrace (like User-Mode Linux) to trap system calls. The new project is not only for networking but it is a general Partial Virtual Machine framework for Linux.
LWIPv6, originally distributed with Ale4NET has evolved and the latest versions are distributed with the View-OS project.
This is the old Ale4NET Project page ....