-v in/up bps 
-t [FritzBox] WAN interface
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DEF:d=/var/www/mrtg/rrd/fritzbox.wan.rrd:ds0:AVERAGE
DEF:u=/var/www/mrtg/rrd/fritzbox.wan.rrd:ds1:AVERAGE
CDEF:down=d,8,*
CDEF:up=u,-8,*
AREA:down#CC9A5780:Down
AREA:up#2EA34960:Up
LINE1:down#CC9A57
LINE1:up#045C55
LINE1:0#000000