Explain how max datagram frame size interacts with PTMU

Question

Explain how max datagram frame size interacts with PTMU

tfpauly opened this issue 6 years ago · 3 comments

We should add text to explain how the application may effectively still have smaller datagram payload sizes due to small PMTU (and interface MTU) even if the max datagram frame size is large. Essentially, the effective at any point is the MIN(max frame size, PMTU, MTU)

Answer 1 · 2019-03-08T01:01:10.000Z

Agreed. Note that PMTU <= MTU because PMTU is defined as min (MTU_l) for all links l

Answer 2 · 2019-03-08T05:32:33.000Z

Fair point!

Answer 3 · 2019-03-27T14:42:00.000Z

Also discussed interaction with PMTUD in Prague: Noted that some of that interaction with QUIC will need to be solved more generally, but this issue is more specific and covers specific text.