Internet Access via Site-to-Site IPSec VPN

Hi Gurus

I have configured a site-to-site IPSec VPN Tunnel between a Fortigate and a Mikrotik. It works fine. I can ping devices on either side of the tunnel.

Site A = Fortigate (WAN IP = 197.154.204.14 : LAN = 172.16.231.0/24 : GW = 172.16.231.1)
Site B = Mikrotik (WAN IP = 64.57.122.212 : LAN = 192.168.204.0/22 : GW = 192.168.204.1)

How do i configure the Mikrotik so that the computers/devices on the Site B LAN get internet services from Site A? I am not sure how to get this done.

i.e. the devices on Site B traverse the tunnel for all internet browsing, etc

You are not supposed to duplicate post…
For anyone else the thread is located here → http://forum.mikrotik.com/t/internet-access-via-site-to-site-ipsec-vpn/163554/1