Dear Colm; On Jan 7, 2007, at 8:50 AM, Colm MacCarthaigh wrote:
On Sat, Jan 06, 2007 at 08:46:41PM -0600, Frank Bulk wrote:
What does the Venice project see in terms of the number of upstreams required to feed one view,
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Supposedly FTTH-rich countries contribute much more to P2P networks because they have a symmetrical connection and are more attractive to the P2P clients.
And how much does being in the same AS help compare to being geographically or hopwise apart?
That we don't yet know for sure. I've been reading a lot of research on it, and doing some experimentation, but there is a high degree of correlation between intra-AS routing and lower latency and greater capacity. Certainly a better correlation than geographic proximity.
As is frequently pointed out, here and elsewhere, network topology != geography.
Using AS proximity is definitely a help for resilience though, same-AS sources and adjacent AS sources are more likely to remain reachable in the event of transit problems, general BGP flaps and so on.
Do you actually inject any BGP information into Venice ? How do you determine otherwise that two nodes are in the same AS (do you, for example, assume that if they are in the same /24 then they are close in network topology) ?
-- Colm MacCárthaigh Public Key: colm +pgp@stdlib.net
Regards Marshall