[Users] Client and FreeSwan Gateway

Dear all,

I would like to ask, how the VPN connection can be establish for internal lan with a FreeSwan gateway.

Maybe I put a picture here:

PCa----------GWa------Internet-------GWb------PCb

GWa and GWb are freeswan gateway, so VPN is established in between. What happen if I want to have a VPN to encrypt to internal traffic, between PCa & GWa. Is that I just setup freeswan on PCa or is that any other VPN client I can use to connect to the GWa from PCa?

Tahnks for all helps...

Calvin