> Hi, > > I’m observing that NetworkManager (v1.20.2) does not recognise the MTU > (=1360) exposed by the ModemManager’s (v1.10.6) bearer object and instead > uses some > default value (=1500). This seems to lead to issues which are fixed when > manually setting the MTU to a lower value. When checking the NetworkManager’s > connection settings, gsm.mtu is set to “auto". I’m observing this on a > Quectel BG96 hooked up via QMI. My kernel version is 4.19.87. > >Is this a known issue? Is anyone aware whether this is fixed upstream? > > Thanks, > Sven
See here for an analysis I did for OpenWRT's Netifd and the MTU from the bearer. It's not the same as your situation, so please don't think I'm trying to provide a fix, it's simply a related issue, that's all. https://github.com/openwrt/packages/issues/11383
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