Fig 1. With VPNmonitor, you can monitor all the wireline/wireless traffic. You can visualize the connections between computers, and how they communicate with the outside network. You can observe secured connections between computers in different colors. Currently VPNmonitor classicfy the following protocols into secure protocols: VPN protocols(PPTP and IPSec), SSL protocol (HTTPS) and SSH protocol.
Figure 2. All the unencrpted messages are displayed on the screen. You may realize what type of messages are obtainable by monitoring the network. With the filter function, you can filter the messages and all the desired results are deplayed in front of your eyes.
Figure 3. The statistics page contains a list of data obtained during the session of monitoring. It includes a lookup of IP addresses. If you are deploying VPN to secure your corporation wireless network, you may observe the proportion of workers using the VPN. Usually more enforcement is needed to make sure workers are making use of the VPN utility provided by the corporation.