North American Network Operators Group
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: Network end users to pull down 2 gigabytes a day, continuously?

  • From: Marshall Eubanks
  • Date: Sun Jan 07 09:25:09 2007

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,



<snip>

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 [email protected] 


Regards
Marshall