North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Improving Robustness of Distributed Services (Re: DDoS attacks)
On Thu, 12 Jul 2001, Dickson, Brian wrote: > - What is IRC, or for that matter net-news, at its heart? A transient, > store-and-forward, one-to-many message system. > > In otherwords, multicast re-implemented on unicast, in some cases poorly and > at great cost (news). AFAIK, there is no implemented multicasting protocol - routing and reliable transport - that can scale to the number of groups, senders and receivers visible in current IRC networks. Source-based trees would require the order of 1E6 (S,G) pairs and core/RP-based routing would be an even easier target for the SK's than IRC already is. Achieving instant group messaging on a global scale with convential multicast is unlikely. Relevant academic research continues. J
|