Initial commit.

Dockerfile

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+FROM debian:buster
+MAINTAINER yohan <783b8c87@scimetis.net>
+ENV DEBIAN_FRONTEND noninteractive
+ENV TZ Europe/Paris
+RUN apt-get update && apt-get -y install xl2tpd
+COPY xl2tpd.conf /etc/xl2tpd/
+COPY options.l2tpd /etc/ppp/
+COPY route.sh /etc/ppp/ip-pre-up
+RUN chmod +x /etc/ppp/ip-pre-up
+RUN mkdir -p /var/run/xl2tpd/
+ENTRYPOINT ["/usr/sbin/xl2tpd", "-D"]

options.l2tpd

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+ipcp-accept-local
+ipcp-accept-remote
+noccp
+noauth
+idle 1800
+mtu 1410
+mru 1410
+nodefaultroute
+usepeerdns
+debug
+connect-delay 5000
+logfile /dev/stdout

route.sh

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+#!/bin/bash
+
+ip route change default via 172.31.1.2
+ip route add 192.168.1.0/24 via 172.31.1.1 dev eth0

xl2tpd.conf

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+[global]
+access control = no
+
+[lac test]
+lns = 192.168.1.1
+require authentication = no
+name = LinuxVPNserver
+ppp debug = yes
+length bit = yes
+redial = yes
+autodial = yes
+pppoptfile = /etc/ppp/options.l2tpd ; ppp options file for this lac