No need to give public IPs to all the 4 computers.
Just give a single Public IP to the Linksys routers’ WAN interface with subnet mask, DNS and relevant stuff.
Turn on the DHCP functionality of Linksys router which will give private IPs to all the 4 computers and wil
It is not a good idea to give computers a public IP unless absolutely necessary. You should map an IP and open a firewall providing access only to ports/services on the hosts. Your router/gateway should be intelligent enough to provide port address translation (PAT) for hosts on the private side who need access to the public side. This will prevent the malicious world of the public internet from directly accessing all services on the private hosts.
Some address translation boxes permit using the same IP address but different ports to internal devices.
I suspect that your ISP gave you some public IP’s but those should be mapped at the public interface of the router and not on the private side of the router. You will assign a different subnet to the private side and then the router public interface performs the address translation to the internal hosts.
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