I recently purchased a useful gadget called CloudShell to house my ARM-based big.LITTLE octa core processor board called Odroid XU4 and a SATA 2.5 inch hard disk. My plan is to use it as a home server to expose services that can be accessed from the Internet. But before I open up the firewall to allow access to this server from the Internet, I want to make sure proper security is in place. The major requirement is that even if this server has been compromised, intruders cannot make use of this server to access my other home computers, tablets, mobile phones and file servers on the home network.