You will probably be using the supplied `make-secnet-sites' program to
generate your VPN's list of sites as a secnet configuration from a
more-human-writeable form. If so you need to install the standard
-`future' and `ipaddr' Python modules (python-future and python-ipaddr
-on Debian-derived systems).
+`future' and `ipaddress' Python modules (python-future and
+python-ipaddress on Debian-derived systems).
** System and network configuration