Did a UDP/IP/Ethernet "stack" (relied on a packet driver shim / smth to send / recv the Ethernet frames) in NASM for DOS while having couple months of experienc

Did a UDP/IP/Ethernet "stack" (relied on a packet driver shim / smth to send / recv the Ethernet frames) in NASM for DOS while having couple months of experience and using Tannenbaum's book and RFCs. Worked great (was sitting in a TSR, was stress tested via sending a storm of packets over a short netwrok cable directly to the machine (otherwise network printers would halt :)) while having Elite:Frontiers running its Cobra ship animation on the screen). Were the times :) [ humble point is, with things as simple as UDP, special-cased for no packet fragmentation, etc and when the scenario is LAN, you can do it easily and over couple days even, if you really have no other options ]