FWIW…. Upper layer protocols can also do their own source-frag if they send IP over raw sockets.
Joe > On Mar 17, 2018, at 2:40 PM, C. M. Heard <he...@pobox.com> wrote: > > Minor Comments: > > Section 2.2, Upper-layer Protocols, says: > > Upper-layer protocols can operate in the following modes: > > o Do not rely on IP fragmentation. > > o Rely on IP source fragmentation only (i.e., fragmentation at the > source node). > > o Rely on IP source fragmentation and downstream fragmentation > (i.e., fragmentation at any node along the path). > > Upper-layer protocols running over IPv4 can operate in the first and > third modes (above). Upper-layer protocols running over IPv6 can > operate in the first and second modes (above). > > The first sentence of the last paragraph above is incorrect. In fact upper > layer protocols running over IPv4 can operate in the second mode by > instructing the IP layer to do source fragmentation and set the DF bit on > outgoing packets. I won't argue if you point out that most APIs don't support > this mode, but the fact is that the protocol allows for it.
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