> Can you provide a somewhat less generic term for "the VPN traffic"? > > If the VPN has an interface, then you can monitor this like you monitor > any other interface, yes with Nagios / Cacti and the like... > Dear Glies, 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.