Linux is like that: you can do anything, but sometimes it’s not easy for a common user. As for me, I hate writing config files for VPN, because network-manager is awesome. But sometimes it’s not easy to make it work.
The biggest problem for me is LT2PT/IPSec. There is an excellent article on how to enable it using network-manager-l2tp. But as on-line articles have a tendency to be removed, I want to save these instructions here.
Install the prerequisites:
sudo apt install \
intltool \
libtool \
network-manager-dev \
libnm-util-dev \
libnm-glib-dev \
libnm-glib-vpn-dev \
libnm-gtk-dev \
libnm-dev \
libnma-dev \
ppp-dev \
libdbus-glib-1-dev \
libsecret-1-dev \
libgtk-3-dev \
libglib2.0-dev \
xl2tpd \
strongswan
Get network-manager-l2tp:
git clone https://github.com/nm-l2tp/network-manager-l2tp.git
cd network-manager-l2tp
autoreconf -fi
intltoolize
Configure the build:
./configure \
--disable-static --prefix=/usr \
--sysconfdir=/etc --libdir=/usr/lib/x86_64-linux-gnu \
--libexecdir=/usr/lib/NetworkManager \
--localstatedir=/var \
--with-pppd-plugin-dir=/usr/lib/pppd/2.4.7
Next:
make
sudo make install
Remove AppArmor settings for IPSec:
sudo apparmor_parser -R /etc/apparmor.d/usr.lib.ipsec.charon
sudo apparmor_parser -R /etc/apparmor.d/usr.lib.ipsec.stroke
Replace x2ltpd with libpcap:
sudo apt remove xl2tpd
sudo apt install libpcap0.8-dev
wget https://github.com/xelerance/xl2tpd/archive/v1.3.6/xl2tpd-1.3.6.tar.gz
tar xvzf xl2tpd-1.3.6.tar.gz
cd xl2tpd-1.3.6
make
sudo make install
Restart your machine, profit.