One Comment

  1. Andrew

    I know this is old, but I had a similar difficulty and was able to find a better solution method. The Network Manager connection settings files are located under /etc/NetworkManager/system-connections/. The configuration options are described here:
    https://developer.gnome.org/NetworkManager/stable/nm-settings.html

    mtu is one of the available options for some confgurations. Simply add a line mtu= to a section, reboot, and the problem is handled.

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