Is a hefty Linux distro more than you have the appetite for? Not interested in all that extra software in Damn Small Linux? Zeroshell might be perfect for you. It’s a Linux distribution specifically created for embedded systems like routers, net balancers, firewalls, proxy servers, OpenVPN clients and DNS servers.
As a bonus, it turns out that Zeroshell Linux is the perfect operating system for a Raspberry Pi device.
Unique to this Linux distribution, Zeroshell has no graphical interface or GUI software included. You will have to access and configure it all from a Web browser running on a different machine.
It does include a RADIUS server for secure authentication, QoS management and traffic shaping support, HTTP proxy server, host-to-LAN and LAN-to-LAN, multi-zone DNS, and support for Kerberos 5 authentication.
Even better, it’s available as a live CD distribution and it can be run easily from a flash drive. There’s even a 512MB image you can download that’s bootable.