osx elcapitan portforwarding to Parallels VM using pfctl

As you all know parallels 11 removed portforwarding functionality from standard version, i am trying to setup portforwarding using pfctl.
I have follwed this answer answer however this does not seem to work.

it can successfully forward port x to port y on 127.0.0.1 but can not forward port x from mac to port x on parallels vm.

What could be going wrong !, is it parallels which is dropping packets etc ?

Here's my original question on stackoverflow http://stackoverflow.com/questions/40695684/osx-elcapitan-portforwarding-to-parallels-vm-using-pfctl

I think its possible to setup the portforwaring for paralles by manually modifying the network.desktop.xml as per this https://forum.parallels.com/threads/missing-network-settings-dhcp.329417/ -- however i dont see any example and have not been able to do the same.

i have wasted half day trying to setup port forwarding .. Any help would be appreciated,