On Tue, 2012-05-15 at 15:10 +0000, Shiv. NK wrote: > Thanks for the information sent. VPN is between two Cisco routers. using > SNMP, it is possible to monitor the interface traffic for a snmp enabled > device through Zabbix/Cacti. But cannot differentiate between the the kind > of traffic. > Saying other way, there is internet traffic on the same interface part > from VPN consumption. I am searching for a specific tool if exists, that > can differentiate the kind of traffic and graph separately. VPNs usually create Tunnel interfaces. These interfaces have statistics like any other interface. Those statistics can be polled via SNMP. So any decent NMS should be able to monitor those. I monitor dozens of Tunnel (VPN) interfaces using ZenOSS; in my case these are GRE tunnels protected using IPSec associations.