Ok, I set up the pptp server and I set up my computer to connect. It works, gives me a address of 192.168.100.21 and server address of 192.168.100.20. However I cannot access the inside of that routers network (192.168.100.0) even with proxy-arp on both interfaces.
name: you login example eclipse
password: you password
local address: put the IP of you MK (the inside LAN IP)
remote address: of course put other segment example 192.168.20.241
routes: the IP of MK (the inside LAN IP of MK)
the secret of PPTP VPN is the local address, remote address, and routes.
the remote and local address, should be different.
i have 6 MK and use PPTP for go to inside and see the radios in (web) my radios is in the same segment of remote address of course.