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Re: Tier-2 reachability and multihoming

  • From: Patrick W Gilmore
  • Date: Thu Mar 24 01:55:14 2005

On Mar 24, 2005, at 12:06 AM, G Pavan Kumar wrote:

On Wed, 23 Mar 2005, Michael Loftis wrote:

I think that likely you're looking at partial data (well i am sure you are, since i'm part of the internet and you didn't' get routing data from me...)
Duh !
Not nice to make fun of people who are trying to help you.


and not seeing paths because of that. The BGP tables of a single node list all outward paths to other places. Thus from a single sample point it is totally impossible to 'map' the internet.

Not to mention the *constant* change in routing.
Actually, I am not doing what you think I am. I am using the RouteViews aggregation of the BGP routing tables. RouteViews is a project at the univ. of Oregon that peers with backbones and other ASes at interesting locations so as to make it as comprehensive as possible. Also, it updates the data every 2 hours of everyday. So, I am looking at almost full and fresh data :>
Unfortunately, the paragraph above shows me that there are errors in your base assumptions about how the Internet works. A couple of people have tried to point this out to you, you should listen instead of telling them why they are wrong.

It is bad to base conclusions on incorrect assumptions. It is even worse to assume those of whom you ask for help know less than you do about the topic at hand.

I am very sorry that you spent a lot of time probably doing good work digging through the route-views archives but have seem to come to false conclusions. It can be difficult to admit hard work has come to a bad end.

However, it might not have been a waste. You seem to have the motivation, time, and energy to research the topic, perhaps your research can be quickly applied to different data, or in a different way? Might I suggest a Google search for past research on Internet topology? I believe the University of Oregon has done some. :) And CAIDA. And many others. Many are still doing research and happy to collaborate.

Good luck in your research.

--
TTFN,
patrick





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