Very Computer

My current network is running like this:

(Virtual IP running application on 64.62.2.251)Linux Server
NIC(64.62.2.250)
--> (64.62.2.249) e0-Cisco with IPsec-e1(64.62.2.241) --->internet
-->(66.1.2.3)CheckPointFirewall---> 192.168.0.1,192.168.0.2
(application server)

And is the 64.62.2.2.241 is my publicIP, 64.2.2.250 is my privateIP
for this VPN?  Or 64.62.2.251 is my privateIP.

My application will be running on 64.62.2.251,
all my request will goto 192.168.0.1,192.168.0.2 (application server)
and the request from 192.168.0.1,192.168.0.2 (application server) goto
64.62.2.251

How the VPN going to implement in this network?
Btw, how should i configure to this Cisco router to test the VPN, more
details needed.

If i use 192.168.0.3 to replace 64.62.2.251 as my Private IP, what
should i need to configure to my Cisco Router so the VPN between Cisco
-- CheckPoint will working.
And how about my application which should listen n running on
64.62.2.251 on Linux server, any conflict with 192.168.0.3 ?

Thx
-qaz