DD-WRT PPTP Setup This method works with FrootVPN and DD-WRT Routers

Go to basic setup on your router then select PPTP as default its DHCP

Fill in the details for your VPN

Then use these settings for the rest.

WAN Connection Type
Connection Type
Gateway (PPTP Server)
Username
Password Unmask
Use DHCPYes No
WAN IP Address...
Subnet Mask...
Gateway...
PPTP EncryptionEnable Disable
Packet ReorderingEnable Disable
Connection Strategy
Connect on Demand: Max Idle Time Min.
Keep Alive: Redial Period Sec.
Additional PPTP Options

Optional Settings
Router Name
Hostname
Domain Name
MTU
STPEnable Disable

Network Setup

Router IP
Local IP Address...
Subnet Mask...
Gateway...
Local DNS...

Network Address Server Settings (DHCP)
DHCP Type
DHCP ServerEnable Disable
Start IP Address192.168.1.
Maximum DHCP Users
Client Lease Time min
Static DNS 1...
Static DNS 2...
Static DNS 3...
WINS...
Use DNSMasq for DHCP
Use DNSMasq for DNS
DHCP-Authoritative

Time Settings
NTP ClientEnable Disable
Time Zone
Summer Time (DST)
Server IP/Name

Reboot your router