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Install pptpd server and ppp service

[root @ centos ~] yum install -y pptpd ppp

Enable ipv4 forward
Method #1

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[root @ centos ~] echo 1 > /proc/sys/net/ipv4/ip_forward

Method #2

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[root @ centos ~] nano /etc/sysctl.conf

Edit line

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net.ipv4.ip_forward = 0

to

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net.ipv4.ip_forward = 1

Reload sysctl settings

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[root @ centos ~] sysctl -p /etc/sysctl.conf
net.ipv4.ip_forward = 1

Configure pptpd

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[root @ centos ~] nano /etc/pptpd.conf
option /etc/ppp/options.pptpd
logwtmp
bcrelay eth1
connections 10
localip 192.168.30.1
remoteip 192.168.30.2-254

Where eth1 is the LAN interface and eth0 is the WAN interface.

Configure chap-secrets with users, passwords and reserved ip addressees

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[root @ centos ~] nano /etc/ppp/chap-secrets
# Secrets for authentication using CHAP
# client server secret IP addresses
"user1" "pptpd" "password1" "192.168.60.2"
"user2" "pptpd" "password2" "*"

Firewall configuration for clients using VPN connection via LAN interface

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[root @ centos ~] iptables -A INPUT -i eth+ -p tcp -m multiport --dport 1723,47 -j ACCEPT
[root @ centos ~] iptables --table nat -A POSTROUTING -o eth0 -j MASQUERADE
[root @ centos ~] iptables -A FORWARD -p tcp -s 192.168.60.0/24 -j TCPMSS --syn --set-mss 1356

Start pptpd server

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[root @ centos ~] service pptpd start

or

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[root @ centos ~] /etc/init.d/pptpd start

Forum Mihai Moldovan

PPTP VPN Server configuration

PPTP VPN Server configuration