FLI... what? What the heck is this?
In Short: "FLoppy ISDN for Linux". A Linux distribution, which is especially designed to build a DSL/ISDN router, has only little requirements to the hardware and which can be installed without any special knowledge about Linux. If you want to know more about FLI4L, may have a look at the official website of this project at http://www.fli4l.de.
There are also a number of newsgroups (spline.*) about FLI4L and EISFAIR (also English). If you want to search something there, you can use the search form.
Since end of may 2003 there is a FLI4L box running at my place, which is responsible for the following tasks (see also Software in my FLI4L):
Since april 2005 i used the development version 2.1.9, which contains a lot of improvements (some of the OPTs for this version where improved as well). Meanwhile (mai 2009) i use the "official" version 3.4.0.