pptpd

The Point-to-Point Tunneling Protocol is a method for implementing virtual private networks.

PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets.

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~/fig/pptpd/
├── docker-compose.yml
├── pptpd.conf
├── pptpd-options
└── chap-secrets

file: docker-compose.yml

pptpd:
  image: vimagick/pptpd
  volumes:
    - ./pptpd.conf:/etc/pptpd.conf
    - ./pptpd-options:/etc/ppp/pptpd-options
    - ./chap-secrets:/etc/ppp/chap-secrets
  privileged: true
  restart: always

file: pptpd.conf

option /etc/ppp/pptpd-options
pidfile /var/run/pptpd.pid
localip 192.168.127.1
remoteip 192.168.127.100-199

file: pptpd-options

name pptpd
refuse-pap
refuse-chap
refuse-mschap
require-mschap-v2
require-mppe-128
proxyarp
nodefaultroute
lock
nobsdcomp
novj
novjccomp
nologfd
ms-dns 8.8.8.8
ms-dns 8.8.4.4

file: chap-secrets

# Secrets for authentication using CHAP
# client    server  secret          IP addresses

username    *       password        *

Please use strong password in cha-secrets file to protect your server.

server

$ modprobe nf_conntrack_pptp nf_nat_pptp
$ cd ~/fig/pptpd/
$ docker-compose up -d
$ docker-compose logs

You need to config firewall:

To let PPTP tunnel maintenance traffic, allow port 1723/tcp.
To let PPTP tunneled data to pass through router, allow proto gre.
Set net.ipv4.ip_forward=1
Set DEFAULT_FORWARD_POLICY=ACCEPT

client

Connect PPTP server using username:password with mppe-128 encyption.

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pptpd

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server

client

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