Vincent Lefevre wrote: > On 2021-12-15 06:09:12 +0000, Tim Woodall wrote: > > On Tue, 14 Dec 2021, Dan Ritter wrote: > > > > > Vincent Lefevre wrote: > > > > I don't have any issue with the mobile hotspot (thus wifi between the > > > > laptop and the phone) or with a Cosmo under Android 9 (instead of the > > > > Samsung Galaxy Note10+), but in both cases, this is much slower, and > > > > I sometimes get wifi disconnections. > > > > > > > > On my Debian laptop, I'm using NetworkManager (nmcli). > > > > > > Have you investigated the MTU? This sounds like a mismatch > > > between what your laptop and phone are using. > > > > > > Diagnosis (besides looking at connection details on both sides): > > > ping with increasingly large packet sizes. If it works at small > > > IPv4 packet sizes and then stops, that's the problem. > > Indeed, this works up to > ping -4 -s 1472 joooj.vinc17.net > ping -6 -s 1452 joooj.vinc17.net
ip link set USBNET0 mtu 1450, or something like that. I don't know NetworkManager's syntax for that; random googling suggests that they at least had a historical problem with not being able to set MTU on anything other than a pure ethernet or wifi link, but perhaps they've solved that? -dsr-
