l2tpns is a layer 2 tunneling protocol network server (LNS) published as a free software under the terms of the GPLv2.
l2tpns is essential to several orgs of the federation as a mean to provide Internet connectivity to their users through xdsl backhaul contracts.
It is currently maintained by a team of people active within a federation of
non-profit ISPs: FFDN.
Part of the team is responsible for packaging l2tpns within Debian:
https://tracker.debian.org/pkg/l2tpns
Source code : https://code.ffdn.org/l2tpns/l2tpns
Mailing list : https://lists.ffdn.org/wws/info/l2tpns