[Bluecobra]

Not sure if I agree with it being the worst mistake. The beauty of UDP is its simplicity and you get the absolute minimum. (And that’s the way I like it!) I’ve worked on low latency financial networks that route 40+ Gb of UDP multicast daily and error free. Nobody is fragmenting UDP packets, and most packet sizes are less than 1000 bytes. All financial exchanges have their own proprietary format, but all use sequence numbers in the data gram to keep track of packets.

[tptacek]

A UDP protocol that deliberately keeps datagram sizes below 1000 bytes to avoid fragmentation is essentially handling fragmentation itself, as Colm proposes UDP should have done to begin with.