:: Setup PPTPd VPN on Linux

:: What is PPTP
The Point-to-Point Tunneling Protocol (PPTP) is a method for implementing virtual private networks. PPTP uses a control channel over TCP and a GRE tunnel operating to encapsulate PPP packets. – WikiPedia
 
:: Verifying PPTPd is working

cat /dev/ppp
cat: /dev/ppp: No such device or address

 
:: How to setup pptpd vpn in Debian Linux
+ Installing pptpd

aptitude install pptpd

+ Configure pptpd

vi /etc/pptpd.conf

setup or change on these line:

localip 1.2.3.4
remoteip 10.0.0.1-200

* 1.2.3.4 = your server ip
** 10.0.0.1-200 = ip address for clients
 
+ Setup DNS Server for clients (Google public DNS)

vi /etc/ppp/pptpd-options

uncomment or setup in these line, like:

ms-dns 8.8.8.8
ms-dns 8.8.4.4

+ Create user login info for PPTP VPN

vi /etc/ppp/chap-secrets

add username anda password for the clients, example:

userjono * passwd123 *

+ Setup MTU

vi /etc/ppp/ip-up

add this line :

ifconfig $1 mtu 1400

+ Restarting pptpd

/etc/init.d/pptpd restart

 
:: Setup Firewall
+ Enable NAT connection

iptables -t nat -A POSTROUTING -j SNAT --to-source 1.2.3.4

* 1.2.3.4 = your server ip
 
+ Save configuration

iptables-save
iptables-save > /etc/iptables.conf
cat > /etc/network/if-pre-up.d/iptables <
 

:: Enable ip forwarding
vi /etc/sysctl.conf
add this line:
net.ipv4.ip_forward = 1
then apply the configuration
sysctl -p
 

:: Links

+ Google

+ PutDispenserHere