legacy MTU of 1500 bytes
legacy MTU of 1500 bytes
Posted Nov 5, 2022 9:47 UTC (Sat) by farnz (subscriber, #17727)In reply to: legacy MTU of 1500 bytes by stephen.pollei
Parent article: Moving past TCP in the data center, part 1
To an unfortunately large extent, broken Path MTU discovery is accepted on the Internet because you can pretty much assume that a 1280 byte MTU will be close enough to optimal that it makes no practical difference. If we had much larger MTUs - 6,000 bytes for 100M Ethernet, 24k for gig, 96k for 10G (yes, this needs jumbograms at the IP layer), WiFi probably at around 12k for 802.11n, and about 50k for 802.11ac, we'd have much more incentive to get PMTUD working well - the difference between 1280 bytes (minimum IPv6 frame size), and 12k for 802.11n is huge.