Thais works fine, however I want to configure this in DD-WRT and have tried using both the PPTP WAN setting and the PPTP client when using standard DHCP WAN.
Currently in my VPN config on Linux Mint the only two VPN authentication methods I have active are MSCHAP and MSCHAPv2 and I think this could be the problem, however I am not certain.
I am completely new to DD-WRT so if anyone has any ideas I would greatly appreciate it.