ubuntu 14.04 pptp server

PPTP Installation

$apt-get install pptpd

$nano /etc/pptpd.conf

localip 10.0.0.1
remoteip 10.0.0.100-200

$nano /etc/ppp/chap-secrets :

# Secrets for authentication using CHAP
# client server secret IP addresses
vpn89Hn pptpd oij$7H0Hp *
vpn32oA pptpd j54dsG-as *

$nano /etc/ppp/pptpd-options

ms-dns 8.8.8.8
ms-dns 8.8.4.4

Start PPTP daemon:

$service pptpd restart

Step 3 - Setup Forwarding

$ nano /etc/sysctl.conf and add the following line if it doesn’t exist there already:

net.ipv4.ip_forward = 1

To make changes active, run sysctl -p

Step 4 - Create a NAT rule for iptables

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE && iptables-save

If you would also like your PPTP clients to talk to each other, add the following iptables rules:

iptables --table nat --append POSTROUTING --out-interface ppp0 -j MASQUERADE
iptables -I INPUT -s 10.0.0.0/8 -i ppp0 -j ACCEPT
iptables --append FORWARD --in-interface eth0 -j ACCEPT

Saving/Updating your Iptables Configuration
sudo apt-get update
sudo apt-get install iptables-persistent

If you ever update your firewall and want to preserve the changes, you must save your iptables rules for them to be persistent.

Save your firewall rules with this command:

sudo invoke-rc.d iptables-persistent save