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In this paper, the authors describe a practical yet effective technique to monitor the amount of bytes that several classes of protocols, such as peer-to-peer, e-mail, etc., transmit over encrypted virtual links, such as IPSec tunnels. The experiments described in this paper demonstrate that their regression-tree-based bandwidth estimator is effective enough to create usage models inherently robust to changes in path, number of users and type of protocols multiplexed over the encrypted link. In other words, their experimental results indicate that training data obtained from a test IPSec tunnel can be successfully used to monitor bandwidth usage on other encrypted tunnels where only the ciphertext is available.
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