hi, just install MRTG recently(early this week) on a Centos 7; And found out 
today we could view the summary of the total bandwidth used with this command - 
mrtg-traffic-sum [options...] config-file
but after running, it will show '0'. we suspect it did not found the log file 
or something as it must at least show us something before '0'.
we are not Linux people, so not familiar with its file location/path. after 
searching online, this is the command we use -
cd /etc/mrtg/mrtg-traffic-sum mrtg.cfg
here is the output:Subject: Traffic total for 'mrtg.cfg' (1.9) 2017/04
Start: Sat Apr  1 00:00:00 2017End:   Sun Apr 30 23:59:59 2017Interface         
                           In+Out in 
MB------------------------------------------------------------------------------enp0s5
                                                  0tap_vpn                      
                           0
note: we are login as root
thank you,
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