We performed some high-level analyses on these hyper-specific prefixes
about a year ago and pushed some insights into a blog post [1] and a
paper [2].
While not many ASes redistribute these prefixes, some accept and use
them for their internal routing (e.g., NTT's IPv4 filtering policy [3]).
Dear NANOG,
Our apologies to those who received this message via multiple channels.
My colleagues and I recently revisited the topic of prefix
de-aggregation attacks. We believe that the current IPv6 allocation
policies combined with the ever-growing number of interconnection
opportunities ma
ur ASNs is suddenly announcing space that is not ours , and
that is coming from a network that isn't under our control.
On Mon, May 2, 2022 at 2:07 PM Lars Prehn <[redacted]> wrote:
Short Disclaimer: I frequently use the PEERING testbed myself, so I'm
genuinely interested in where and
Short Disclaimer: I frequently use the PEERING testbed myself, so I'm
genuinely interested in where and why people draw the boundary of what's
fine and what's not.
Iirc., the route collectors see a (drastically varying) number of
poisoned routes (assuming everything within a loop is poisoning)
Okay, so some automated PeeringDB-based approach seems to be the
preferred road.
~30% and ~40% of IPv4 and IPv6 PeeringDB prefix count recommendations
are 0. How do you treat those cases? Does it also boils down to a simple
"we don't peer with them" ?
Best regards,
Lars
On 18.08.21 12:31,
On 18.08.21 12:36, Saku Ytti wrote:
On Wed, 18 Aug 2021 at 12:36, Lars Prehn wrote:
As I understand by now, it is highly recommended to set a max-prefix
limit for peering sessions. Yet, I can hardly find any recommendations
on how to arrive at a sensible limit.
You are missing two important
As I understand by now, it is highly recommended to set a max-prefix
limit for peering sessions. Yet, I can hardly find any recommendations
on how to arrive at a sensible limit.
I guess for long standing peers one could just eyeball it, e.g., current
prefix count + some safety margin. How does
stry.
Thanks in advance,
Lars
[1]
https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
On 02.08.21 16:56, Valdis Klētnieks wrote:
On Mon, 02 Aug 2021 11:57:54 +0200, Lars Prehn said:
Is there a reason why the status of 2002::/16 in IANA's IPv6 u
Hi,
Is there a reason why the status of 2002::/16 in IANA's IPv6 unicast
assignments list [1] is ALLOCATED (with '6to4' as designation and the
note field indicating reservation) rather than RESERVED?
Best regards,
Lars
[1]
https://www.iana.org/assignments/ipv6-unicast-address-assignments/i
Does anybody have (somewhat frequent, e.g., monthly) snapshots of the
various IRR databases lying around? Any snapshot since 2010 would be
helpful!
Best regards,
Lars
Hi Amir,
Neither providing an abstract nor the high-level takeaways of your work
is a rather blunt way to promote your paper. I have a bunch of comments
and questions, but I'm only a student so take them with a grain of salt.
Regarding ROV++ v1: Let's modify your example in Figure 2a slightly
r that provides the BGP feed.
Regards
Baldur
lør. 18. jul. 2020 23.34 skrev Lars Prehn <mailto:lpr...@mpi-inf.mpg.de>>:
Hi everyone,
In the next couple of months, I want to compare data plane and
control
plane measurements on a larger scale. In particular, I'm looki
have SSH access to run any commands you want and there is an API to
find the probes if you want to automate it all.
I encourage anyone and everyone to join. The more networks the better!
Brendan
On Sun, 19 Jul 2020, 7:36 am Lars Prehn, <mailto:lpr...@mpi-inf.mpg.de>> wrote:
Hi ev
find the probes if you want to automate it all.
I encourage anyone and everyone to join. The more networks the better!
Brendan
On Sun, 19 Jul 2020, 7:36 am Lars Prehn, <mailto:lpr...@mpi-inf.mpg.de>> wrote:
Hi everyone,
In the next couple of months, I want to compare data pl
Hi everyone,
In the next couple of months, I want to compare data plane and control
plane measurements on a larger scale. In particular, I'm looking for
(publicly accessible) devices that receive BGP feeds and can perform a
bunch of automated (paris) traceroutes. I currently do not have an exa
Hi everyone,
Is there a "fast" way to obtain a snapshot of the RDAP databases from
each RIR (e.g., http://rdap.db.ripe.net/) for local use? I saw some
presentations on proposals for RDAP monitoring, but couldn't find any
working implementations. I want to run a massive amount of requests
agai
wrote:
Don't user as-sets step one.
Rpki does not understand how to express an as-sets' authorization.
Why do you want to do this?
On Mon, Apr 13, 2020, 13:34 Lars Prehn <mailto:lpr...@mpi-inf.mpg.de>> wrote:
Hi everyone,
how exactly do you aggregate routes? Wh
Hi everyone,
how exactly do you aggregate routes? When do you add the AS_SET
attribute, when do you omit it? How does the latter interplay with RPKI?
Best regards,
Lars
Hi everyone,
do you NTP sync your AS boundary routers? If so, what are incentives for
doing so? Are there incentives, e.g. security considerations, not to do it?
Best regards,
Lars
in list just doesn't change that frequently.
-mel via cell
On Dec 15, 2018, at 1:30 AM, Lars Prehn wrote:
Hi Mel,
I already checked Archive.org - it holds two previous copies.
lets you download each version of the list that archive.org noticed changed
According to Archive.org's own Note
posted, ad you’ll get a history that lets you download each version of the list
that archive.org noticed changed. In my experience, that is pretty
comprehensive.
-mel beckman
On Dec 15, 2018, at 12:31 AM, Lars Prehn wrote:
Hi everyone,
In order to sanitize historical BGP data I would
Hi everyone,
In order to sanitize historical BGP data I would like to use historical
Bogon lists. The CIDR report generates those lists on a daily basis
(e.g. https://www.cidr-report.org/bogons/freespace-dec.txt for prefixes)
but, as far as I know, it does not keep a history of those files - i
Hi everyone,
I'm planning to download a significant amount of PCH's available MRT
data. Is there anyone that could forward me (maybe off-list) contact
information for one of the current maintainers?
Thanks in advance!
Best regards,
Lars
Hi,
Does anybody have more or less recent data on the average, median and maximum
diameter (ip hop count) of the Internet?
First, to give some hints regarding the initial question: A year ago I
did some analysis based on Caida's routed /24 topology data set
(https://www.caida.org/data/activ
- Original Message
On Apr 26, 2018, 4:46 PM, Lars Prehn < lpr...@inet.tu-berlin.de> wrote:
Hi all,
two quick questions:
Is there any way to retrieve BGP data (e.g. table dumps, updates,
...)
such that i.) the data is not already available in the RIPE RIS,
Hi all,
two quick questions:
Is there any way to retrieve BGP data (e.g. table dumps, updates, ...)
such that i.) the data is not already available in the RIPE RIS,
Routeviews, PCH, Isolario, or BGPmon projects and ii.) it is not
necessary to query a Looking Glass to death (e.g. get all neigh
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