Site 2 site vpn behind nat on hotel

At home i have a rb2011, and for travels i have a rb433 with 2 sets of wlan cards.

At home i have several gre tunnels for administering networks / sites i manage (which works well when im home).
But i would like to be able to manage these networks / sites when im on the road. I already have a ipsec l2tp server setup on the rb2011, so i can connect home with an attached computer, but i would like all this to happen automagicly from the rb433 as soon as i have connected it to the hotel wifi (or for that matter, if im visiting other companies and connect the rb433). I have tried some of the guides, but none seem to connect. Does anyone have a good idea / example for getting this running? Have in mind that i wont have access to the hotels routers to set any nat rules.


In advance, thanks for any replies :slight_smile: