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That FAQ is located at http://humdi.net/vnstat/FAQ since that's the easiest way to keep it updated. ---- A snapshot of the FAQ (updated 29.5.2011): Is there some kind of support forum available? The forum is located at http://forums.humdi.net/ 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? No. How should dialup users use vnStat? There's some errors because the interface isn't available when offline. Dialup users should use the daemon for updates. It will take care of enabling and disabling the database every time the interface comes and goes. It is still also possible to use cron based updates even with a dialup interface but that requires proper setup of scripts with enable/disable commands every time the status of the interface changes. Example scripts can be founds from the pppd directory that came with the source packages. Does vnStat work for PPPoE users? Yes. PPPoE is basically like a dialup connection and it can be monitored in the same way as any ppp interface. However, with PPPoE it's usually also possible to bring up the LAN interface used for the connection without configuring any ip to it. Monitoring that interface is a good alternative since it doesn't go down and up when the connection is closed and opened again. How do I stop monitoring an interface? Go to the vnStat database directory (default: /var/lib/vnstat) and delete the database file named according to the interface you want to stop monitoring. The daemon needs to be stopped before this procedure if it's being used for updates. 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 intructions 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 --dumpdb? That features only dumps 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 ... Why does vnStat show sometimes multiple GB of traffic although my network connection can't even transfer that much? OR Each update adds the complete amount of traffic and 'vnstat -u -D' claims that the system has been rebooted between updates. That's most likely a broken kernel. Run with --testkernel (version 1.2+ required) and see the result. Also make sure that the maximun bandwidth setting has been configured properly according to the network connection. See the next question for some explanation about possible kernel problems. Why is there problems with most 2.4.18 kernels? Every current kernel has a btime (boot time) value in /proc/stat that indicates when the system was booted. vnStat uses this to know when the interface counters in the database should be reseted. Unfortunately, some kernels don't keep the btime value static even when the system isn't rebooted. About bug reports Any bug report should at least include an explanation about how the bug can be reproduced. Having output dumps usually helps and the --dumpdb feature should be used if there's some reason to assume the bug has something to do with the database. Also include information about the used distribution, kernel (uname -a), compiler (gcc --version) and network interface card. Read the report again before sending it. :)