After upgrading from Ubuntu 14.04 to 18.04 my USB modem's interface name changed from wwan0 to wwx001e101f0000. I do not mind that and also read this has some good reasons. Unfortunately vnstat stopped working for this interface:

$ vnstat -i wwx001e101f0000
Error: Unable to read database "/var/lib/vnstat/wwx001e101f0000": No such file or directory

It works properly for ethernet interface enp4s0:

$ vnstat
Database updated: Wed Aug 29 09:09:11 2018 enp4s0 since 08/15/2018 rx: 24.93 GiB tx: 10.19 GiB total: 35.12 GiB monthly rx | tx | total | avg. rate ------------------------+-------------+-------------+--------------- Aug '18 24.93 GiB | 10.19 GiB | 35.12 GiB | 123.21 kbit/s ------------------------+-------------+-------------+--------------- estimated 27.27 GiB | 11.15 GiB | 38.42 GiB | daily rx | tx | total | avg. rate ------------------------+-------------+-------------+--------------- yesterday 16.45 GiB | 2.26 GiB | 18.71 GiB | 1.86 Mbit/s today 107.07 MiB | 473.64 MiB | 580.71 MiB | 147.83 kbit/s ------------------------+-------------+-------------+--------------- estimated 280 MiB | 1.21 GiB | 1.48 GiB |

I would need some alternative to measure consumed data as I use this modem with limited amount of data available (LTE modem). Is there any alternative? I found just a lot of tools which offers real time traffic monitoring, but I need the historical data.

1 Answer

I realized vnstat will work properly even for interface wwx001e101f0000 but I had to do this:

sudo vnstat -u -i wwx001e101f0000
Error: Unable to read database "/var/lib/vnstat/wwx001e101f0000": No such file or directory
Info: -> A new database has been created.

And then set this in /etc/vnstat.conf

# default interface
Interface "wwx001e101f0000"

So the problem is solved.

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