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iljitsch.com

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Hi, I'm Iljitsch van Beijnum. These are general neworking-related posts.

The rise of IPv6 and fall of IPv4 in the 2010s

The 2010s were the decade that we ran out of IPv4 addresses and the decade that IPv6 deployment got underway—but IPv4 is still going strong even without a fresh supply of addresses.

Here's an overview of what happened with IPv4 and IPv6 in the 2010s.

Permalink - posted 2020-01-08 - 🇳🇱 Nederlandse versie

❝Beating BGP is harder than we thought❞

In a paper for the HotNets'19, seven researchers admit that "beating BGP is harder than we thought". (Discovered through Aaron '0x88cc' Glenn.) The researchers looked at techniques used by big content delivery networks, including Google, Microsoft and Facebook, to deliver content to users as quickly as possible. This varies from using DNS redirects to PoPs (points of presence) close to the user, using BGP anycast to route requests to a PoP closeby and keeping data within the CDN's network as long as possible ("late exit" or "colt potato" routing).

Turns out, all this extra effort only manages to beat BGP as deployed on the public internet a small fraction of the time.

Full article / permalink - posted 2019-12-30

Bluesky: Twitter wants a federated Twitter

Twitter's Jack Dorsey, in (of course) a Twitter thread:

Twitter is funding a small independent team of up to five open source architects, engineers, and designers to develop an open and decentralized standard for social media. The goal is for Twitter to ultimately be a client of this standard.

This is interesting on several levels. I'll mostly talk about the protocol design part of this, but before I do that: when has a business that's pretty much in a monopolist position ever voluntarily given up that position? They must really be feeling the pushback against "content and conversation that sparks controversy and outrage", and see this as a way out.

Full article / permalink - posted 2019-12-17

Slides: AS paths: long, longer, longest

Presentation slides from my lightning talk "AS paths: long, longer, longest" at the RIPE-79 meeting in Rotterdam, 18 October 2019.

Permalink - posted 2019-11-29

Valid address space, bogons and martians

There are some advantages to filtering out packets with invalid addresses in them. That would be a packet with a private source or destination address, for instance. Those never have any business traveling across the internet. (Not to be confused with BCP 38 filtering.) For instance, there have been instances where spammers grab an unused prefix, start announcing it in BGP, do a spam run and then drop the prefix. When packets with private addresses enter your network, bad things may happen if you use those addresses yourself. And these invalid "martian" packets are just an annoyance, using up traffic and generating log entries.

Full article / permalink - posted 2019-11-28

Europe runs out of IPv4 addresses even further, what now?

Less than three months ago I wrote about how the uptake of the remaining IPv4 addresses at RIPE was accelerating, with the RIPE NCC likely to run out of the addresses set aside in the "last /8" before the end of the year. And so they did, two days ago. So as of this week, it's no longer possible to request address space in the RIPE service region (Europe, former Soviet Union, Middle East) and get them within a somewhat predictable period...

Full article / permalink - posted 2019-11-27

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