Linux Mint - Install PPTP VPN Server

1. Install PPTP VPN Server.
apt-get install pptpd

2. Edit pptpd.conf file to add your VPN server ip settings.
gedit /etc/pptpd.conf
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localip 192.168.60.10
remoteip 192.168.60.20-30
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3. Edit pptpd-options file to add dns server and encryption.
gedit /etc/ppp/pptpd-options
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ms-dns 8.8.8.8
ms-dns 4.4.4.4

#require-mschap-v2
+chap
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4. Add username and password
gedit /etc/ppp/chap-secrets
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aaa    pptpd    bbb    *
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5. Edit sysctl.conf for network forward.
gedit /etc/sysctl.conf
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net.ipv4.ip_forward=1
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6. Configure your firewall.
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iptables -A INPUT -i eth0 -p tcp --dport 1723 -j ACCEPT
iptables -A INPUT -i eth0 -p gre -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -A FORWARD -i ppp+ -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0 -o ppp+ -j ACCEPT
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7. Start your PPTP VPN Server.
pptpd restart