Now that you have your policy in place, it is time to get your
hands dirty and start implementing the monitoring and controlling measures. You
can monitor everything from Web access, e-mail and websites providing
audio / video streaming to e-commerce transactions and even VPN connectivity
between your various offices.
To check if you are getting the right amount of bandwidth, you need to monitor to see if your ISP is providing you the promised bandwidth and check for other internal bottlenecks, such as any misconfigured or overloaded proxy server.
Many tools are available for this. Some of the better known ones are MRTG, PRTG, PRTG Pro and Ntop. MRTG (Multi-Router Traffic Grapher) is widely used by most ISPs and is available for Windows and Linux. PRTG (Paessler Router Traffic Grapher), a variant of MRTG, is a freeware Windows based tool that lets you monitor only a single network port. Once PRTG is installed, you
need to add a sensor for the network ports you want to monitor. A sensor is
nothing but the IP address of the network card you want to monitor. You also
need to ensure that SNMP is enabled on the machine you are Monitoring, as PRTG uses it for polling and gathering data. The tool provides real-time graphs of the traffic moving in and out of the network port. It can create detailed HTML reports of the bandwidth on a daily, weekly or monthly basis. You should use it to monitor the network port of your Internet Gateway.
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