From: Blake Hudson [mailto:blake@ispn.net]
Yeah, that's an interesting one. We currently utilize netflow for this,
but you also need to consider that netflix streaming is just port 80
www traffic. Because netflix uses CDNs, its difficult to pin down the
traffic to specific hosts in the CDN and say that this traffic was
netflix, while this traffic was the latest windows update (remember
this is often a shared hosting platform). We've done our own testing
and have come to a good solution which uses a combination of nbar,
packet marking, and netflow to come to a conclusion. On a ~160Mbps
link, netflix peaks out between 30-50Mbps around 8-10PM each evening.
The rest of the traffic is predominantly other forms of HTTP traffic
(including other video streaming services).
We (Sandvine) also have a product that does this measurement in the IP network, per CDN, per device type (e.g. how much Netflix on xbox is on Akamai vs Limelight). In addition it measures the delivered quality per CDN. Anyone can feel free to contact me off list for more information. [cid:image001.jpg@01CCBBE1.BCF573A0]
