-v in/up bps 
-t [webmail] net
--full-size-mode
--color=BACK#343637
--color=CANVAS#F0F0F0
--color=FONT#F0F0F0
--font=TITLE:12:DejaVu Bold
DEF:rx=/var/www/mrtg/rrd/lxc-webmail.net.rrd:ds0:AVERAGE
DEF:tx=/var/www/mrtg/rrd/lxc-webmail.net.rrd:ds1:AVERAGE
CDEF:RX=rx,8,*
CDEF:TX=tx,8,*
COMMENT:        max.          avg.         min.         cur.\n
AREA:RX#CC9A5760:Rx
GPRINT:RX:MAX:%6.2lf %sbps
GPRINT:RX:AVERAGE:%6.2lf %sbps
GPRINT:RX:MIN:%6.2lf %sbps
GPRINT:RX:LAST:%6.2lf %sbps\n
LINE1:TX#2EA349:Tx
GPRINT:TX:MAX:%6.2lf %sbps
GPRINT:TX:AVERAGE:%6.2lf %sbps
GPRINT:TX:MIN:%6.2lf %sbps
GPRINT:TX:LAST:%6.2lf %sbps\n