Route PPTP over other Gateway

Hi,

I have a a network where i cant open pptp connections. Now i would like to route this traffic over the LTE modul from my RBD53G. All the other traffic should go out over the default gateway
The problem is that i have not routing mark option in ROS7

you can always route ip for pptp server over another gateway via ip routes.
maybe can be helpfull for you

i would like to mark the TCP Port 1723 and the GRE. Then i would like to route this pakets