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Doug Madory (also on Bluesky) Profile picture
@DougMadory
Aug 31, 2020 • 5 tweets • 6 min read • Read on X
As part of our measurement platform, we run 100s of millions of traceroutes per day - normally 1.5 million traverse AS3356 per hour.

At the nadir of the #centurylinkoutage, we were only seeing 474k successful traceroutes via AS3356 - a drop of 68%!

map.internetintel.oracle.com/?root=traffic&…
Because of the massive scale of these networks, these charts rarely exhibit any movement.

The disturbance caused by the outage and subsequent de-peering is visible on the charts of other "Tier-1" telecoms in the DFZ.

map.internetintel.oracle.com/?root=traffic&… ImageImageImageImage
To get a feel for how traffic changed globally during the outage, we can use this tool to look out incoming traceroutes to various content providers like these:

map.internetintel.oracle.com/?root=traffic&… ImageImageImageImage
Because of the importance of AS3356 to the global internet, major cloud providers experienced impacts to varying degrees.

map.internetintel.oracle.com/?root=traffic&… ImageImageImageImage
Access networks both foreign and domestic (US) can be seen impacted by the degradation and loss of AS3356, arguably the most important transit in the world.

map.internetintel.oracle.com/?root=traffic&… ImageImageImageImage

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More from @DougMadory

Doug Madory (also on Bluesky) Profile picture
Nov 21
Finally had some time to dig into the subsea cable cuts in the Baltic Sea that have gotten a lot of attention lately.

Due to the region's rich fabric of connectivity, the cable cuts caused minimal disruption.

However, here are some subtle BGP impacts I was able to identify. 🧵
I estimate that the BCS East-West Interlink was cut at 07:53 UTC on Nov-17 and the impacts are visible in both Lithuania and Latvia.

submarinecablemap.com/submarine-cabl…Image
Hundreds of prefixes transit by Telia Lithuania (AS8764) exhibited a slight decrease in transit from Arelion (AS1299) at the time of the cable cut.

78.61.16.0/20 and 78.57.128.0/20 are shown below. Image
Image
Read 9 tweets
Doug Madory (also on Bluesky) Profile picture
Aug 24, 2022
In my latest blog post for @kentikinc, I join forces with @JobSnijders of @fastly once again. This time to answer an important question:

How much does RPKI ROV reduce the propagation of RPKI-invalid BGP routes?

kentik.com/blog/how-much-…
This analysis was motivated by a discussion following the recent Rostelecom hijack of Apple:

It seemed a good time to run the numbers for the whole routing table.
The big takeaway is that propagation is cut in half when a route is evaluated as RPKI-invalid (mostly due to most tier1's rejecting invalids). This will have the effect of blunting the impact of a future origination leak, for example.
Read 6 tweets
Doug Madory (also on Bluesky) Profile picture
Aug 22, 2022
Large disruption of Internet services in #Pakistan.

According to @kentikinc data, traffic dropped by 40% at 17:57 UTC (10:57pm local). Image
Also visible in @gatech_ioda:
The internet of Pakistan has been dealing with multiple challenges in recent weeks.

Including a submarine cable outage on Aug-12 and an outage due to monsoon rains:
dawn.com/news/1704419
Read 5 tweets
Doug Madory (also on Bluesky) Profile picture
Mar 18, 2022
It’s been >3 weeks since the #UkraineRussiaWar began.

Despite many outages, Ukraine's Internet is still online due in part to the heroic efforts by local techs fixing disruptions at great risk to themselves.

A 🧵 of 30-day snapshots of Ukrainian internet connectivity...
From @Kentikinc’s view, overall peak traffic levels into Ukraine have declined by about 20%.

This reflects a drop in internet usage that can be attributed to damaged infrastructure and fewer Ukrainian users due to millions of Ukrainians fleeing, among other factors.
Alternatively, @gatech_ioda focuses more on infrastructure and less user traffic levels.

It observes a visible decline in BGP routes, hosts responding to pings (active probing), as well as background traffic.

ioda.inetintel.cc.gatech.edu/country/UA?fro…
Read 6 tweets
Doug Madory (also on Bluesky) Profile picture
Feb 1, 2022
I was curious of the origin of the assertion in this piece that Russia cut a subsea cable when it annexed Crimea in 2014.

This biggest issue is that there was no subsea cable connecting Crimea at the time.

Follow me as I try to find the origin of this story…
This starts with @jserhmcyber’s piece published yesterday.
atlanticcouncil.org/blogs/new-atla…

"When Russia illegally invaded and annexed Crimea in 2014, one of its first actions was to cut a submarine cable linking the peninsula to the outside world."

That cites…
An article by LCDR Dennis E. Harbin III entitled Targeting Submarine Cables…
tjaglcs.army.mil/-/-targeting-s…
Which states:
"During the annexation of Crimea…, one of Russia’s first acts was to disrupt internet connectivity to the Crimean peninsula and isolate it…"

That cites…
Read 16 tweets
Doug Madory (also on Bluesky) Profile picture
Jan 15, 2022
Island nation of #Tonga is completely offline following a #tsunami triggered by a massive volcanic eruption in the Pacific Ocean.

According to @kentikinc data, traffic volumes began to drop around 4:30 UTC (5:30pm local) before finally going to zero at 5:40 UTC (6:40pm local).
Here's a view of the eruption from space:
Our data matches @CloudflareRadar tool for #Tonga. (cc: @dbelson)

radar.cloudflare.com/to?date_filter…
Read 8 tweets

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