vpn site to site, remote site behind firewall

I am trying to connect several computers located in a remote site to our company network.  we have been given internet access but not a public ip address.  we can use addresses in the range

I would like to create a site to site vpn using a product like pfsense.  our company firewall is checkpoint firewall 1.

Can anybody give some assistance with this?
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When you write "we can use addresses in the range" where is that subnet?

More information would be helpful.

An Outline of a Common Point to Point (PTP) VPN Configuration:
Corporate Office:
Private Subnet:  Such as 192.168.x.0/24
Firewall with VPN Capability
Public Subnet: Such as 249.x.x.x /xx. USUALLY a static IP is provided by the ISP.
Internet over which the Point to Point VPN Link travels
Remote Office:
Public Subnet: Such as 183.x.x.x /xx. USUALLY a static IP is provided by the ISP.
Firewall with VPN Capability
Private Subnet:  Such as 192.168.y.0/24
Note: Just as for any network (private or public), all the private subnets that can route to each other must be uniquely addressed within the network (that is, different from each other). Hence, you will notice above that Corporate is 192.168.x.0 and Remote is 192.168.y.0 allowing each to route to the other.

Most PTP configurations use public static IP addressing. Some firewalls will allow using fully qualified domain names (FQDN). With the latter, you can use dynamic IP addresses for the public side of the firewalls along with registering them with a Dynamic DNS (DDNS) service.

 - Tom

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