1. Tinkernet The Presentation Dan Turner, Mark Kegel, Erik Shimshock and Ryan Ausanka-Crues With Support and Encouragement by Titus Winters and Mike Erlinger (also Jason Arold)

2. Project Overview What is Tinkernet? System to allow students to write the networking code of an OS Why would you want it? Provides a convenient and controlled environment to write and test networking code

3. How it works... SSH Tinkerbell Students Nodes TFTP

4. Hardware Rack of nodes Basic (old) computer minimal components (RAM, CPU, etc.) Two network cards Couple of hubs, many ethernet cables Server Standard computer (lots of RAM) Linux

5. Student Assignments Writing modules to handle the protocol stack ethernet, IP, UDP, ARP TCP - could do but is a lot of work Scaled down version of TCP

6. Student Perspective SSH in to a server (Tinkerbell) Write the network module for a kernel Filling in a code template Compile code on the server; run on node Debugging code Tinkerboot netprintf

7. The Real Perspective (1) Student writes code (2) Student compiles code into kernel (3) Student uses tinkerboot to load kernel (4) Student tests kernel (5) Kernel dies, and student repeats the first four steps

8. Behind the Scenes: Compiling the Kernel OSKit provides a fully operable kernel we strip out the networking module student code gets compiled in as the new networking module then you have your kernel...

9. Behind the Scenes: Booting the Kernel tinkercontroller is a daemon that manages the nodes a free node is chosen, and the kernel is sent to it if all has gone well, you have a running kernel

10. The Running Kernel Kernels are expected to respond to: ARP requests IP broadcast Handle IP packets Also UDP Also need to be able to generate their own packets

11. Controlling the Kernel Each node has two network cards Is hooked in to two separate networks: warzone and admin Student packets are sent over warzone Admin network handles management of each node - booting, restarting, debug

12. Individual Projects Dan Grub OSKit Packet dropping

13. Individual Projects Erik Built a new rack Solved missing nodes Documentation Comments

14. Individual Projects Mark Set up team computers Tinkerboot GUI Tinkeradmin GUI

15. Individual Projects Ryan Built rack Missing nodes problem Website and wiki Commenting and re-factoring code

16. Things left to do... Documentation... Portability... Packaging for distribution...