1) all (meaning all hitting the zayo.telia) your traceroutes originate
from University in Chicago
2) the zayo.telia device is physically close to the university
3) we should expect physically close-by backbone device to be present
in disproportionate amount of traceroutes
4) almost certainly zayo.t
Looking at your 1 repeat ORD example:
On Tue, Jan 18, 2022 at 12:17 AM PAUL R BARFORD wrote:
> 6 64.125.15.65 1.895 ms [x] (zayo.telia.ter1.ord7.us.zip.zayo.com.,
> CAIDA-GEOLOC -> Chicago, IL, US)
>
> 7 62.115.118.59 99.242 ms[x] (prs-b3-link.ip.twelve99.net.,
> CAIDA-GEOLOC -> Par
Please find the examples for the case of Telia below.
FROM jfk-us (jfk-us.team-probing.c008820.20201002.warts.gz)
traceroute from 216.66.30.102 (Ark probe hosted in New York City, NY, US. No AS
info found) to 223.114.235.32 (MAXMIXD: Turpan, CN)
1 216.66.30.101 0.365 ms
2 62.115.49.173
I guess it depends what you’re considering a “very few” number of routers but
this seems to be an expected outcome. While there are a large number of wet
cable landing stations, they are highly concentrated near a small number of
metro areas, and with the exception of capacity owned by the ILECs
+180v and -180v for a total of 360v. At really low amperage. Still makes a
respectable bang if you short it on the MDF. It gets converted on-site,
either in the DSLAM or in a separate box. I think it's 12v to the ONT.
On Mon, Jan 17, 2022 at 3:30 PM Michael Thomas wrote:
>
> On 1/17/22 2:39 PM,
What we're considering specifically are consecutive (layer 3) hops as
identified by traceroute. Thus, TTL is decremented by 1 and no more than 1
(i.e., we have to get full information (not *) from consecutive hops to
consider the link). I have asked my colleague to put together a set of
e
On 1/17/22 2:39 PM, Jordan wrote:
On Thu, Jan 13, 2022 at 02:06:39PM -0800, Michael Thomas wrote:
For my ISP, they maintain backup power for both DSL and POTS. I
suspect that for a lot of DSL that would hold true because it's
relatively easy for them to power since they already have the
batte
On Mon, Jan 17, 2022 at 5:31 PM PAUL R BARFORD wrote:
> Dear Pengxiong,
>
> Thanks for your questions:
>
>
>1. We are using CAIDA’s Internet Topology Data Kit (ITDK) that uses
>the MIDAR alias resolution method to infer IP addresses assigned to the
>same router.
>2. We understand
Dear Pengxiong,
Thanks for your questions:
1. We are using CAIDA’s Internet Topology Data Kit (ITDK) that uses the
MIDAR alias resolution method to infer IP addresses assigned to the same router.
2. We understand the concerns about IP geolocation. Interfaces of the
router in question ar
Carrier class core routers still cost half a million dollars each or (way)
more, so it’s not uncommon for there to be 2-4 in a metro.
And there are only a few metros that have undersea cable landing stations.
We deploy a minimum of a pair of core routers everywhere, but with our
BGP/OSPF/iBGP c
On 1/17/22 2:24 PM, Aaron C. de Bruyn via NANOG wrote:
My "small" (< ~5,000 customers) ISP won't uncheck that box for me no
matter how much I beg, plead, or offer to bring them snacks for their
office.
Chuckle.
They keep mumbling stuff about FCC requirements which I suspect is just
handwavin
On Mon, Jan 17, 2022 at 11:43 AM Jeff Shultz wrote:
> BTW, Calix ONTs default to "Disable on battery = on" for the GigE ports -
> it's checkbox in the config to turn that off so they stay up when the power
> is out. Which we do uncheck. Particularly since we've going increasingly
> VOIP and our e
Hi Paul,
Just curious. How do you determine they are the same routers? Is it based
on IP address or MAC addresses? Or using CAIDA’s router alias database?
Also how do you draw the conclusion that the AS1299 router is indeed in
Chicago? IP-geolocation based on rDNS is not always accurate though.
On Mon, 17 Jan 2022 at 20:00, PAUL R BARFORD wrote:
> What we're curious about is why we're seeing a concentration of hops at a
> small number of routers that appear on international paths.
I suggest you share a few actual examples (IP addresses, traceroutes).
I don't think discussing your conc
As one of those Telco/ISP's, it's growing more and more likely that
DSL/POTS are now on the same card and they are all tied into the 48V
battery and generator protected plant. And Alpha Electronics is probably
selling a lot of those Power over Copper systems for powering remote Calix
E3-12C and E3-
Hello Nick,
I've added my collaborators to this reply - Esteban can comment on your
observation re. Telia.
TTL is decremented on the paths we're analyzing. What we're curious about is
why we're seeing a concentration of hops at a small number of routers that
appear on international paths. I
PAUL R BARFORD wrote on 17/01/2022 18:02:
For example, there is a router operated by Telia (AS1299) in Chicago
that has a high concentration of such links.
this doesn't appear to match 1299's public network topology:
https://www.teliacarrier.com/our-network.html
Is ttl decrement disabled on t
Hello,
I am a researcher at the University of Wisconsin. My colleagues at
Northwestern University and I are studying international Internet connectivity
and would appreciate your perspective on a recent finding.
We're using traceroute data from CAIDA's Ark project for our work. We've
observe
On 1/17/22 09:57, Brandon Butterworth wrote:
Isn't the argument here that if it's in most chip sets already it might
reasonably be expected to be a standard low end feature by now, along
with IPv6?
That it isn't may be why people are open to SRv6 (I'm assuming some are
based on this discussi
> Isn't the argument here that if it's in most chip sets already it might
> reasonably be expected to be a standard low end feature by now, along
> with IPv6?
>
> That it isn't may be why people are open to SRv6 (I'm assuming some are
> based on this discussion) - if they have to pay extra they onl
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