The Point-to-Point Tunneling Protocol (PPTP) is an obsolete method for implementing virtual private networking.
- Base image: Alpine Linux
- pptpd version: 1.4.0
PPTP uses a control channel over 1732/TCP and a GRE tunnel to encapsulate PPP
packets. An example command to allow GRE (for everyone) with iptables:
iptables -A INPUT -p gre -j ACCEPT
You also need the following modules loaded into the kernel:
modprobe nf_conntrack_pptp nf_nat_pptp
To run a private VPN server with simple username/password auth, create file
chap-secrets based on the one from the examples:
$ git clone https://github.com/adegtyarev/docker-pptpd.git
$ cp config/chap-secrets.example chap-secrets
$ vim chap-secrets # make your changes, dont use the defaults
Start a new container:
docker-compose up -d
The VPN server should be up and ready to serve.
Access the logs with:
$ docker-compose logs -f pptpd
PPTP is known to be a faulty protocol. Nowadays it is strongly recommend not to use it due to the inherent risks. Lots of people use PPTP anyway due to many cheap hardware routers only allows that kind of tunneling. Whenever it possible you should use OpenVPN (SSL based) or IPSec instead.
Alexey Degtyarev @adegtyarev