"In what way is this different from NAT?" I'm not sure how NAT solves this problem at all unless I'm missing something. If you lose a TCP connection from a nat

"In what way is this different from NAT?" I'm not sure how NAT solves this problem at all unless I'm missing something. If you lose a TCP connection from a nat'd device, there's no way to create the same connection ("same" in terms of {IP1, port1, IP2, port1} tuple) again. "I'm guessing you don't need to do things in order like TCP, so you can ask to resend and then stitch it in" Yes that helps. It also helps if the protocol is smart enough to distinguish between congestion based loss vs media error based loss (with a high degree of accuracy). "Where is the beef?" Check out my comment upthread (or downthread... where it's placed on the page now) https://news.ycombinator.com/item?id=12021454 https://news.ycombinator.com/item?id=12021454