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FAQ
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FAQ
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The latest version of this FAQ is available at
https://humdi.net/vnstat/FAQ
----
A snapshot of the FAQ (updated 13.4.2019):
I managed to get invalid data into the database after ... playing around with
the system clock / doing some strange network experiments / having the cron
entry not properly configured. Is there a database editor available?
Nothing vnStat specific is available. The sqlite3 command can be used to
read and modify the database.
How do I stop monitoring an interface?
Execute "vnstat --remove -i interfacename" with correct permissions.
How do I uninstall vnStat?
You only need to run 'make uninstall' in the directory that comes when the
.tar.gz is extracted. Just make sure it's the same version you have
installed. If you've used a binary package included with the distribution
then refer to instructions provided by the package manager.
What is this KiB/MiB/GiB/TiB thing?
See http://en.wikipedia.org/wiki/Binary_prefix#Prefixes and UnitMode
option in the configuration file.
Is the MB value reported by vnStat 10^6 or 2^20 bytes?
2^20 bytes. The prefix can be configured to show MiB from the configuration
file instead of MB if that looks better.
What does the 'estimated' value mean?
The estimated value is an calculated average that tries to predict the total
traffic for the current day/month based on previous traffic. This estimate
works fairly well if the monitored interface has constant traffic of the same
magnitude (like game servers). It can't predic peaks but the accuracy
usually gets better by the end of the day/month.
Why isn't the estimated value shown with --json or xml outputs?
Those features only dump the database and since the estimate is always
calculated in real time, there's no reason to write it into the database.
How is the estimated value calculated?
estimate = ( x / y ) * z
x = traffic so far for the day/month
y = passed minutes/hours ...
z = total minutes/hours ...
About bug reports
If the latest version isn't being used then test if the issue can still
be replicated with the latest or latest development version. If the issue
can still be reproduced, check if there's already an issue open in GitHub.
If not then using https://github.com/vergoh/vnstat/issues for reporting new
issues is suggested. Any bug report should at least include an explanation
about how the bug can be reproduced. Also include information about the used
distribution, kernel (uname -a), compiler (gcc --version) and network
interface card. Read the report again before sending it. :)