[39561] in North American Network Operators' Group
Re: Improving Robustness of Distributed Services (Re: DDoS attacks)
daemon@ATHENA.MIT.EDU (Joshua Goodall)
Sun Jul 15 04:33:31 2001
Date: Sun, 15 Jul 2001 09:33:01 +0100 (BST)
From: Joshua Goodall <joshua@roughtrade.net>
To: "Dickson, Brian" <brian.dickson@velocita.com>
Cc: "'nanog@merit.edu'" <nanog@merit.edu>
In-Reply-To: <4D43FFF36F6DD5118B8F0006299973ED27D306@exchhq01>
Message-ID: <Pine.LNX.4.33.0107150803450.31790-100000@elm.phenome.org>
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Errors-To: owner-nanog-outgoing@merit.edu
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
