Hi,
we have posted preliminary results of our long AS-set announcements to
our web site:
http://www.dia.uniroma3.it/~compunet/bgp-probing/diffusion.html
While we are still working on an in-depth analysis, the results indicate
that while the presence or absence of an AS-set in an announcement
Jeroen Massar wrote:
Btw, if you postponed the 'experiment', how come I did pick up this one:
84.205.73.0/24 12654 12654
{1221,1221,1221,1221,1221,1221,1221,1221,1221,1221,
1221,1221,1221,1221,1221,1221,1221,1221,1221,1221,
1221,1221,1221,1221,1221,1221,1221,1221,1221,1221,
Lorenzo Colitti wrote:
as part of our AS-set stuffing experiments (announced, including links
to in-depth information, in [1]), we will be announcing unusually large
AS-sets tomorrow, Thursday 16 June.
Hi,
due to unforeseen technical difficulties, we have been forced to
postpone
Hi,
as part of our AS-set stuffing experiments (announced, including links
to in-depth information, in [1]), we will be announcing unusually large
AS-sets tomorrow, Thursday 16 June.
The prefixes involved will be 84.205.73.0/24 and 84.205.89.0/24, both
orignating in AS12654. The AS-sets
. For more details, see the presentation and the report.
We will be happy to answer any further questions you might have.
Regards,
Lorenzo Colitti
---
Active BGP Probing
==
What we do
--
Existing topology discovery techniques
Hannigan, Martin wrote:
Yes, but last time you said you were going to use
_other peoples_ ASN's to test with and allow these
announcements beyond your borders.
Is this still the case?
The probing AS (call it Z) announces one of its prefixes to the Internet
with an AS-path that is not just
Randy Bush wrote:
Thus, to stop its announcement from being propagated by ASes 1, 2, and
3, an AS (say AS12654) might announce one of its prefixes with an
AS-path of 12654 {1,2,3}.
won't that prevent 12654's announcements from being received by, as
opposed to propagated by, 1, 2, and 3?
Jeroen Massar wrote:
And it also makes clear why it didn't pop up in GRH, as when you insert
the GRH ASN 8298 it won't be announced to GRH and thus it doesn't get
detected and as quite a number of people check only there it can go
quite unnoticed in the IPv6 tables...*
Actually, we never
Randy Bush wrote:
i think we're ratholing here. can you tell us in simple words
Indeed. Therefore, we are working on a document that will provide a
detailed explanation of our methods, why we believe they are useful, and
why we believe they are safe.
Once it is ready we will post a link to
James A. T. Rice wrote:
You appear to be trying to take advantage of a side effect of this
behaviour, in order to see what other ASn transitive adjacancies are
available that would not normally be used, by inserting the ASns of
transit AS's that would normally be used, into the as path you are
David Schwartz wrote:
Prepending announcements with remote AS numbers has been a well-known
technique for preventing prefixes from propagating to particular ASes
for a long time.
And therefore such use would not be considered experimental. We are
talking
about experimenting with routes that
David Schwartz wrote:
They are experimental in that yes, we are experimenting with a new
technique for topology discovery which to our knowledge has not been
proposed before.
So you do not know what affect your announcements will have.
We don't know the effectiveness of the technique. That
Niels Bakker wrote:
Every piece of BGP documentation I have ever seen says that this
attribute documents the ASes that the route has actually passed
through.
I think the above paragraph of RFC 1771 disagrees with you.
Please quote properly; the context was AS_path, not AS_set.
David Schwartz was
Gert Doering wrote:
2005-03-04:
14:00 UTC: 10-element AS-set
14:30 UTC: withdrawal
16:00 UTC: 25-element AS-set
16:30 UTC: withdrawal
Please do not announce AS-sets that contain 5539. We are not part of
your experiment, and we don't want to see our AS appear in
James A. T. Rice wrote:
This seems to suggest that you are just picking ASns at random to inject
into the paths, and that you don't have a set of ASs which you have the
assignees permission to use.
In which case please keep AS8330, AS8550, and AS8943 out of your
experiments too.
Using not yet
]
Regards,
Lorenzo Colitti
On behalf of the Roma Tre Computer Networks Research group
[1]
http://www.ripe.net/ripe/maillists/archives/routing-wg/2005/msg00021.html
[2] http://www.ripe.net/projects/ris/Talks/0101_RIPE38_AA/sld003.html
[3] http://www.ripe.net/maillists/ncc-archives/ris-users/2002
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