On Tue, 2021-07-20 at 16:26 -0400, David H Durgee via networkmanager- list wrote: > How can I get traffic statistics by network connection? Is there a > way > to retrieve this using nmcli? Is there another tool that will do so? > > I have looked around and the tools I see work at the interface level, > not at the connection level. > > I am using nmcli 1.22.18 as distributed with linux mint 20.1 x64 > here.
Ui, a "connection" is a profile, that is a bunch of settings for configuring a network interface. Basically, see the lower-case keys in `nmcli connection show "$PROFILE". A profile has no traffic statstics, nor would it make sense. Well, that's not entirely correct and I guess it might make some sense to collect statistics associated with a profile. NM associates additional information to prfiles with "connection.timestamp" and "wifi.seen-bssids" properties and there are also the lease files under /var/lib/NetworkManager. But these are exceptions, usually a profile is just the settings that the user configured. In particular traffic statistics are not tracked or associated with connection profiles in NetworkManager (yet). On D-Bus, $ busctl -j call org.freedesktop.NetworkManager /org/freedesktop org.freedesktop.DBus.ObjectManager GetManagedObjects you see the "org.freedesktop.NetworkManager.Device.Statistics" interface (which is per-interface). That exposes the RX/TX bytes. That is basically the same as kernel reports via netlink API. However, the values are stale unless you RefreshRateMs to a positive value (which causes NM to periodically poll the statistics from kernel). There is no further magic with "org.freedesktop.NetworkManager.Device.Statistics". You could just as well read the information via netlink. These statistics are ad-hoc, and will be lost after reboot (or when the interface dispears). I guess you could build an interesting tool for that. I am not aware that one exists. However, the API was added by Ubuntu developers, and presumably the do have a use for it and a tool. best, Thomas _______________________________________________ networkmanager-list mailing list networkmanager-list@gnome.org https://mail.gnome.org/mailman/listinfo/networkmanager-list
