Vincent Lefevre wrote: > Hi, > > When I use USB tethering between my Debian/unstable laptop and my > Samsung Galaxy Note10+ phone (Android 11), everything is OK with > IPv6 connections (e.g. "wget -6"), but IPv4 connections freeze > (e.g. "wget -4" or "ssh -4"). I can notice this in particular when > testing with the same remote server. For instance, with "wget -4", > a few dozens of KB are downloaded, then the connection is completely > frozen. > > 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. -dsr-
