How to give internet to hosts in GRE tunnel?

Question

GRE

There is a pfsense gateway. 1 patch card is physically connected, it has 15 interfaces with external white IPs. For example, interface 1 I1, interface 2 I2, etc. The main interface through which everyone accesses the Internet I1. Inside locale L1.
Created a GRE tunnel with I1 interface. We specified the address of the remote gateway external, the address of the gateway is internal, and the address of our gateway is internal.
Next, we created IPSec, indicated the external address of the remote gateway , traffic through our I1 interface.
The DHCP server is an external remote gateway that distributes addresses, such as 192.168.1.1 for a host.
I ping this host via the GRE interface, via lan, via ipsec, via whatever. But the host has no internet.
Now the question is how to give Internet access to this remote host?

Answer 1

Set up NAT. If you tell me in more detail (for example, draw a diagram), I can say for sure what to NAT where. If you tell Skype or ICQ, we'll decide.