Is there anyone tried install BM3.8 VPN master server behind DSL router?

I bought Craig Johnson's book (third & fourth edition), following his
book, I could setup our VPN network very well. I used BM3.7, now I'm using

But now I got a big problem, in Australia, all ISP will stop support Layer
3 ADSL which "no auth require" DSL. So we have to use DSL router.

In Craig's book, there is a sample for VPN Slave Server behind DSL router.
But I don't know I can setup Master VPN server behind DSL router or not.

Please help!