[CentOS] BandWidth Monitoring

Hi, 
   
  I m using linux as a router and proxy on same machine , i want to monitor bandwidth usage per ipaddress , so plz suggest me the tool that i can use to monitor bandwidth used by which every ipaddress.
   
   
  thanks in advance
   
   


Abhishek Kr. Singh
System Administrator
DSC. LTD.
Mob.No. +91-9871563248
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