update

pptpd/README.md

@@ -4,9 +4,20 @@ pptpd
 [![](https://badge.imagelayers.io/vimagick/pptpd:latest.svg)](https://imagelayers.io/?images=vimagick/pptpd:latest)
 
 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.
 
-## docker-compose.yml
+`PPTP` uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets.
+
+## directory tree
+
+```
+~/fig/pptpd/
+├── docker-compose.yml
+├── pptpd.conf
+├── pptpd-options
+└── chap-secrets
+```
+
+file: docker-compose.yml
 
 ```
 pptpd:
@@ -19,10 +30,51 @@ pptpd:
   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
 ```
 
@@ -32,3 +84,7 @@ You need to config firewall:
 - 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.