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

OSPF: time to get rid of the totally not so stubby legacy

Recently, I was looking through some networking certification material. A very large part of it was about OSPF. That's fair, OSPF is probably the most widely used routing protocol in IP networks. But the poor students were submitted to a relentless sequence of increasingly baroquely named features: stub areas, not-so-stubby-areas, totally stubby areas, culminating in totally not-so-stubby areas.

Can we please get rid of some of that legacy? And if not from the standard documents or the router implementations, then at least from the certification requirements and training materials?

Full article / permalink - posted 2022-05-12

12 april PvIB in Utrecht: "Zijn we niet teveel afhankelijk van de Cloud geworden?"

Op 12 april organiseerde het Platform voor InformatieBeveiliging (PvIB) een avond over het onderwerp zijn we niet teveel afhankelijk van de Cloud geworden? Ik was één van de drie sprekers en vertelde over hoe je je connectiviteit naar de verschillende clouddiensten en - aanbieders zo robuust mogelijk kan inrichten.

Dit is mijn presentatie van die avond.

Permalink - posted 2022-04-12

The HTTPS and HTTP conundrum

The past few days I have added HTTPS support to and About ten years ago, I experimented a bit with SSL/TLS (HTTPS) support in Apache, and that was rather difficult.

But no more. Thanks to the efforts of Let's Encrypt and the ACME protocol as implemented in certbot, adding HTTPS support to your websites is now almost ridiculously easy.

Full article / permalink - posted 2021-11-22

→ Software Engineering Radio: Iljitsch van Beijnum on Internet Routing and BGP

I love podcasts. So I'm every happy to be interviewed about BGP on Software Engineering Radio:

Iljitsch van Beijnum, author of the book BGP: Building Reliable Networks with the Border Gateway Protocol discusses internet routing and BGP – the border gateway protocol used by ISPs to update routing information. Host Robert Blumen spoke with Iljitsch about the topology of the internet, autonomous systems (AS), regulatory bodies that coordinate the AS space, IP addresses, the assignment of IPs to ASs; tier-one ISPs, carriers, and home/business ISPs; Internet routing; the path of a packet; routing tables, what they contain, and how they are constructed; routing algorithms; BGP and its role in updating routers with the knowledge of routes held by other routers; and BGP messages. Drill down into the update message. How updates progress from BGP into routing algorithms and then routing tables. What can go wrong. Attacks on BGP.

Permalink - posted 2021-07-13

Mijn internetsnelheden

In de loop der jaren heb ik een flink aantal verschillende verbindingen naar het internet gehad, en uiteraard werden die steeds sneller. Toen ik ooit die lijn doortrok kwam ik uit op 256 terabit/s wanneer ik met pensioen ga. (De AOW-leeftijd was toen nog 65.)

Tijd om eens te zien of ik inderdaad nog steeds op dat pad zit. Alleen merkte ik dat ik niet echt helder meer had op welk moment ik wat voor lijn met wat voor snelheid had. Tijd voor wat uitzoekwerk dus, en ik zet het hier neer zodat ik het later weer terug kan vinden en kan lachen over hoe sloom alles was in het jaar 2021.

Volledig artikel / permalink - geplaatst 2021-05-31

VLANs on the Mikrotik hAP ac³

For my BGP lab/training setups I have a bunch of routers, real or virtual, that each need several IP addresses to talk to other routers. VLANs are the perfect way to keep all of this manageable: with VLANs, it's possible to have separate IP interfaces, but still just use a single Ethernet port to hook everything up. Simple unmanaged switches simply forward the packets to the right port without looking at the VLAN header, so no need to configure the network.

Until I got my Mikrotik hAP ac³ this week...

Full article / permalink - posted 2021-04-04

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