Setting Up Access List On Cisco Router

In this Example will open ports for need to use out of using will close it alls. This case no have inside (internal) server. Step for setting Up : Router#conf t Router(config)#access-list 100 permit tcp any any range 20 23 Router(config)#access-list 100 permit tcp any any eq 25 Router(config)#access-list 100 permit tcp any any eq [...]