Fast Mode is not needed anymore.
Quote:
| Additionally, performance enhancements in recent VPN-1/FireWall-1 releases eliminate the need for the Fast Mode option, so it will be discontinued in the next major product release (see "Discontinuation of Fast Mode" below). |
http://www.checkpoint.com/services/t.../fastmode.html There is a new option - Wire Mode VPN/ "Enabling Wire Mode on the community allows information to pass through a VPN tunnel without state verification"