Vulnerbilities of Interconnection

Pawlukiewicz Jane pawlukiewicz_jane at bah.com
Fri Sep 6 15:13:33 UTC 2002


Hi,

batz wrote:
> 
> On Fri, 6 Sep 2002, Pawlukiewicz Jane wrote:
> 
> :would be difficult to reach. I'd have to run a model to be sure, but
> :every one of the major seven have rerouting methodologies that would
> :recover from the loss. And I don't think they exclusively peer at
> 
> Even if we were to model it, the best data we could get for
> the "Internet" would be BGP routing tables. These are also
> subjectve views of the rest of the net. We could take a full
> table, map all the ASN adjacencies, and then pick arbtrary
> ASN's to "fail", then see who is still connected, but we are
> still dealing with connectivity relatve to us and our peers,
> even 5+ AS-hops away.

I want to make sure I understand this. As I understand it, this would
work regarding routing only. It would be a model that would have a
result of ones and zeros, so to speak, meaning either you're connected
or you're not. What this doesn't take into consideration, I believe, is
the effects of congestion regarding increased traffic due to news
traffic and rerouting that takes place whenever there is a loss of a
site.

> 
> I would imagine this is one of the tasks CAIDA.org is probably
> working on, as it seems to fall within their mission.
> 
> So even if we all agreed upon a common disaster to hypothesize
> on, there would be little common ground to be had, as our
> interpretations could only be political arguments over what is
> most important, because there is no technically objective view
> of the network to forge agreement on.

I totally agree. I think what I envision as not a huge impact would be
devastating to others. That's mostly because I'm looking at it globally,
like, if you take all routes as the denominator, and the lost routes as
the numerator, four colo sites, even the big ones, wouldn't be *that*
much effect. Proportionally. At first. 

Of course, if you're a smallish ISP operator and your one peering site
happens to be at one of the four sites, you're done.

Jane
> 
> Cheers,
> 
> --
> batz



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