11.25.06

Review of “Revisiting IP Multicast”

Posted in Paper reviews, multicast/anycast at 9:17 am by mbecchi

Despite the fact that IP Multicast has been widely studied in the last fifteen years, none of the proposed infrastructures to implement this service model has been widely deployed and has been proven convincing. In fact, it is still under question whether the benefits implied by the introduction of IP Multicast would compensate and overreach the complexity of its deployment and management in the network level. However, the authors notice how several applications could largely benefit from an underlying multicast communication service, and how the spreading of such applications is dramatically increasing. It is the case, for instance, of multiplayer games, Internet TV technology, video conferencing, file sharing, software updates and more. Thus, the paper revisits IP multicast and proposed a novel approach, called Free Riding Multicast (FRM) for its deployment.
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11.24.06

Review of “Revisiting IP Multicast”

Posted in Paper reviews, multicast/anycast at 7:34 pm by Michael Roche

The authors revisit one of computer networking most studied ideas, IP Multicast. Multicast is one of the few ideas that many technical papers proposed ideas for implementation, but hardly any real world, wide-use protocols have been deployed. The complexity and scalability of the multicast idea is what has caused the difficulties. The authors argue that there are enough applications that would benefit from it and maybe we should take another look at multicast.
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Review of “OASIS: Anycast for Any Service”

Posted in Paper reviews, multicast/anycast at 7:34 pm by Paul Moceri

This paper explores network anycast as an overlay system. When I typically think of anycast, I imagine IP level anycast. Traffic sent to a specific IP address is routed to the “best” of many possible hosts associated with that address. Best could mean closest or least loaded depending on the network. However, the OASIS system presented in this paper does not enable this sort of IP layer multicast. Instead, OASIS provides anycast at higher layers, in particular through the use of DNS and HTTP redirects. In this way, I was disappointed once start into the paper. OASIS, as it turns out, is more of a server selection service than IP anycast.
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Review of OASIS: Anycast for Any Service

Posted in Paper reviews, multicast/anycast at 7:33 pm by traviskeshav

As people finally realize the threat of denial of service attacks, a trend towards distributed systems is appearing. For websites, services such as Akamai have become popular, even though they have a higher monetary cost than a company hosting their websites on their own. Services can be distributed across vast geographic areas, not only to assure that there is no one point of failure, but also to decrease latency, such that users can find replicas of services near them. OASIS implements this as a distributed anycast system, based upon geographic mapping, which also provides answers to problems inhibiting past anycast efforts.
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