On 12/12/2016 10:58 AM, Gorry Fairhurst wrote: >> >> IMO, the app should never need to play with DF. It needs to know what it >> thinks the transport can deliver - which might include transport >> frag/reassembly and network frag/reassembly. > How does the App handle probes for path MTU then in UDP? > > Gorry I think there needs to be two parts to the API:
- largest transmission size - native transmission desired (true/false) If the app says "YES" to native transmission size, then that would suggest that UDP would do *nothing* and pass that same kind of flag down to IP, where IP would not only set DF=1, but also not source fragment. I.e., I don't think it's the app's job to know how to explicitly control a mechanism two layers down, and DF isn't really what you want anyway. DF isn't the same as "don't source fragment". Joe
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