Monitoring network usage on Ubuntu

  If you want to see how much traffic is passing through your network port there’s a handy tool called vnstat which will tally the amount of data passing through. You can install it with:  
sudo apt-get install vnstat
  It will usually add the databases and network ports automatically like so:   vnstat-0   If it doesn’t and gives you an error you can create the database(s) with:  
sudo vnstat -u -i eth0
  If you have multiple network cards/ports you can add those in, too:  
vnstat -u -i eth1 vnstat -u -i eth2 …etc  
If it couldn’t create the databases you can start it with:  
sudo /etc/init.d/vnstat start  
If you need to change the maximum bandwidth from 100Mb you can edit the file:  
  Scroll down until you see the following:  
# maximum bandwidth (Mbit) for all interfaces, 0 = disable feature # (unless interface specific limit is given) MaxBandwidth 100
  and make MaxBandwidth the figure you require (e.g. 1000). If you make a change restart vnstat with:  
/etc/init.d/vnstat restart
  You can now see how much traffic has come through the NIC since vnstat started recording – at first it probably won’t be much (if any), but as it adds up you can check it with:  
  The output should look like:   vnstat-01   You can watch how much traffic is flowing through in real-time by running:  
vnstat -i eth0 -l
  This will give you a screen showing you the current traffic:   vnstat-02   You can end this with CTRL+C, which shows you a summary screen:   dating app in the uk   You can get an hourly summary with:  
vnstat -i eth0 -h vnstat-05   Daily summary with:  
vnstat -i eth0 -d Monthly summary with:  
vnstat -i eth0 -m
  vnstat-06   This is a really handy way of keeping track of your network traffic – whether it’s out of curiosity, wanting to know how much stress your network is under or looking for a bottleneck this can be quite a valuable tool.