[mrtg] Low speed showed

[Jose Julian Buda]

Hi , I have this picture for my fastethernet link on the daily graph, and i have this on /etc/mrtg/cfg
....
#Webserver 
Target[10.30.10.66_2]: 2:poblico at 10.30.10.66:
SetEnv[10.30.10.66_2]: MRTG_INT_IP="192.168.0.1" MRTG_INT_DESCR="eth0"
MaxBytes[10.30.10.66_2]: 12500000
Title[10.30.10.66_2]: WebServer - Control de trafico de Interfaz ETH0 (Interna)
PageTop[10.30.10.66_2]: <H1>WebServer - Control de Trafico Interfaz ETH0(Interna)</H1>
 <TABLE>
   <TR><TD>Sistema:</TD>     <TD>www.noticiasargentinas.com </TD></TR>
   <TR><TD>Administrador:</TD> <TD>Jose Julian Buda &lt;jbuda at noticiasargentinas.com&gt; </TD></TR>
   <TR><TD>Descripcion:</TD><TD>eth0  </TD></TR>
   <TR><TD>ifType:</TD>     <TD>ethernetCsmacd (6)</TD></TR>
   <TR><TD>ifName:</TD>     <TD></TD></TR>
   <TR><TD>Max Velocidad:</TD>  <TD>10.0 Mbits/s</TD></TR>
   <TR><TD>Ip:</TD>         <TD>192.168.0.1 (serverna)</TD></TR>
 </TABLE>
...

How can i be sure that is the real trafic speed? , because it's a fastethernet nic linked to a switch(10/100) port and the max value registered( about 48 Kbps? ), 
not smell good , the form of the graphics is ok, because of the peoples come here to work about 8 AM and they go 1 AM , the problem is the value.
I understand what this faq say ( http://faq.mrtg.org/FAQ014.html  or  http://faq.mrtg.org/FAQ019.html)
What is the default value for the scale used? bits ? kbytes ? 
Its an snmp problem ?
What am i missing?
I used rd hat 70 and UCD-snmp 4.1.2
Thank you and sorry about my english

Jose Julian Buda

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