Skype - Cisco ASR 5000 series Product Overview

Peer-to-Peer Overview

Skype

The Skype detection cannot detect traffic of most of the third-party plug-ins. The plug-ins use Skype only for
marketing and presentation purposes such as opening a window within a Skype window or modifying the main
Skype window with buttons or sounds. These plug-ins do NOT use the Skype protocol to transfer data over the
network.
Other than Skype Voice, all detected Skype traffic is marked as Skype. Distinctions between different data types
within Skype (i.e. text chat, file transfer, and so on) cannot be made.
Skype voice detection may not be accurate if it happens with other traffic (file transfer, video, etc.) on the same
flow.
eDonkey
The eDonkey client eMule supports a protocol named Kademlia. This protocol is an implementation of a DHT
(Distributed Hash Table). Kademlia is only used for searching new peers which have the file the user wants to
download. The download itself uses the eDonkey protocol. However, the Kademlia protocol is not detected as
eDonkey.
The eDonkey client eMule supports a text chat that is not detected as eDonkey.
Yahoo
Yahoo! HTTP downloads for yahoo games, images and ads that come during yahoo messenger startup are not detected
as Yahoo!. If configured, these can be passed on to the HTTP analyzer for HTTP Deep Packet Inspection.
MSN
MSN HTTP downloads such as MSN Games and MSN Applications are not detected. Traffic from these MSN
applications use a different protocol for their traffic.
BitTorrent
Some clients (like Azureus 3.0) provide an advanced user interface which can include an embedded web
browser. These are not detected as BitTorrent. Also other features like chat or instant messaging are not
detected as BitTorrent. These features are client specific and not related to the BitTorrent protocol.
Certain clients also display advertisements. These images are downloaded through plain HTTP and are not
detected as BitTorrent.
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