One of the servers in the public network is your DNS server. Give it a /28 IPv4 address, also configuring its gateway and DNS settings. The other server in the public network is your Web server. Give it an IPv4 address in the same subnet, also configuring its gateway and DNS settings. Configure the DNS service with a record pointing to your Web server (call it www.yourlastname.com). Configure your client systems on your private subnet giving them static IPv4 addresses, don't yet configure its gateway and DNS settings. Try to send pings between the clients