Dear Ricky , 
  Use the following command ,
Do following while you are connected to internet :
Code:
wge*t http://www.web4host.net/tools/install.mrtg.sh
    chmod +x install.mrtg.sh
    ./install.mrtg.sh
then run following command
Code:
env LANG=C /usr/local/mrtg-2/bin/mrtg/var/www/html/mrtg/core/mrtg.cfg
after that.. to access mrtg just type
http://serverip/mrtg
I run my mrtg perfectly . But  i have two question :
 1) Is this MRTG is for my Machine's IP ?
 2)  suppose i  have a cisco swich .  A client network is connected  via this switch port where it's IP is suppose 192.168.10.2 .  In another port (port 3)  my linux server 
is connected where my IP is 192.168.10.3 . In this moment i want to see the Network Traffic or Bandwidth of my client's Network(192.168.10.2) . For this reason is any change is need to make in the above configuration ?
plz help ...........