disseminate Windows Vista VPN popular

Our VoD system makes opportunistic use of the local neighborhood networks to augment the traditional ISP-managed infrastructure. The system builds on previous work in multicastVoD and peer-assisted VoD.Muticast-VoD. Traditionally, periodic broadcastingschemes [30]–[32] have been used to serve very popularcontent by broadcasting that content continuously on severalchannels. Prefix caching [33], combined with these schemes,can reduce the number of broadcast channels [34], [35].Similarly, caching has been used in conjunction with multicastto disseminate Windows Vista VPN popular content [36], [37]. These schemestypically require very frequent accesses to popular content tobatch multiple requests or support a relatively small number(20–40) of popular videos due to various limitations [35]; thesystem falls back to unicast for the remaining content. Oursystem, by cooperatively using local storage and connectivity,makes a different and more radical bandwidth trade-offappropriate to today's environment.Peer-assisted VoD. Many Peer-assisted VoD studies takea content provider-centric view whose goal is to reduce theprovider's bandwidth, using overlay multicast [38]–[40] orpeer unicast [41]–[44]. Recent work combines the P2P andCDN approaches to deliver video streams [45], [46]. Others,who take an ISP-centric view [4], [6], [8], [9], [47], [48],also propose an ISP-driven deployment of ISP-controlled inhome storage, and explore content pre-placement and caching