I'm an IT professional and this is some new use of deep packet inspection with which I am unfamiliar, could someone enlighten me as to how opening TCP/IP packets on the fly to examining their contents can make skype and youtube play more smoothly or prevent people getting a virus ?
Sounds like a confusion with Quality-of-Service for the first bit, and I-don't-know-what for the anti-virus.
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As I understand it, QoS is a somewhat mechanical process which uses information in the packet header to sort data into queues of different priority and is unaware of the packet contents.
Anti-virus normally buffers things in order to scan them, and normally does this at points where e.g. emails are stored/queued, so again not examining the individual data packets on the network, but working on the complete item once it has arrived. There are some which do a sort of on-the-fly scan, but these are still not at the data-packet level (that I know of).