The ISP has given you only one useable public ip address 188.8.131.52.
You will need to create an internal network using private IP addressing and then translate this to the internet using NAT. This is the most common scenario because it keeps the internal network private - there will be no incoming connections unless you allow them.
With your equipment you need to perform the NAT on the 2900 router. A NAT overload solution will work for simple outbound internet access.
The router will need a WAN ip address of 184.108.40.206 on the interface to ISP, set the default route to the ISP 220.127.116.11. Then test internet.
On the internal network interface you will need to use a private ip range.