VPN

Hi guys,
I need help in setting up an IPsec tunnel to reach my office LAN subnet with a latpop connected to internet with a simple modem (not router) to be able to do the same things I do when I'm at office computer. Here is attached my office net scheme. I read m0no related pages but I can't fully understand what all the parameters mean and furthermore what port and protocol should I forward from provider router to m0n0wall wan interface to allow vpn connection?
Thank you very much in advance

The main issue you will face is if the Provider router supports IPSEC pass through.  It would be much easier with PPTP.  UDP port 500 is used for IPSEC.

I have full access to the provider router setup but I don't know what are the settings to do. It is an italian provider router with restricted access but I was able to unlock the full management control panel.
I see bridging option in the provider router web management page but I don't know what should I do.
Thank you

[between two m0n0walls]

I made a further step. I was able to bypass the provider router, because it doesn't allow vpn passthrough but it allows ppoe passthroug. So now the wan interface f m0n0 has the pubblic static ip.
I was reading m0n0 documentation and in the vpn section it says
"This chapter will go over configuring a site to site Virtual Private Network (VPN) links between two m0n0walls"
First question: Do I need 2 m0n0 in for each end of the vpn?
I'd like to connect to office lan (the one with m0n0) from a laptop connected to internet by a simple modem.
Is it possible?
Furthermore according to the scheme I posted, what should I set as Remote subnet and Remote Gateway?
Thanks

There is asection in the FAQ for setting up road warriors with IPSEC however, if you are using windows, then you would probably have to use a third party IPSEC client.  They give an example usinf Safenet SoftRemoteLT.  However I don't believe this is available from Safenet anymore.  If you google, you should be able to find a copy somewhere.