@nuintari @danamcfarland it isn't that big at all & will probably never need most of this space. But why not make the best out of this gift & use it as intended: to establish a well-structured address plan & help keeping the DFZ small. The 1st /32 is used for "own infra" and is almost empty. The 2nd /32 is splitted into /44 and sub-assigned to customers. This company probably won't need another prefix in the foreseeable future, which is a good thing for global routing tables. #bgp #dfz #ipv6

@nivex Yup, it's a thing and makes sense from an operational point of view. I think I didn't checked if the prefixes to which these IPs belonged to were announced in the #BGP #DFZ back then - but they probably weren't.

I remember seeing public IPv4 addresses from Xerox and the US DoD assigned to DTAG LTE SIMs internally in Germany (04/2020), probably because they ran out of RFC1918 space. Do you have other such examples? I would like to collect them. (boosts in the IP/ net admin bubble appreciated!)

#ipv4 #telco #networking #network #telekom #sysadmin #ipv6 #cgnat #nat #rfc1918 #internet #dtag #bgp #dfz

A bit of an unofficial post-mortem on #Optus #outage yesterday (please BOOST for visibility!) I have no insider knowledge, all I can do is look at what Optus's networking gear told the rest of the world through #BGP, and make some informed guesses based on that.

The problem yesterday started at about 4am, when Optus told the world 'I no longer have any internet connectivity', and 'Do not send any internet traffic to me, at all'. The technical description is that they withdrew ALL of their routes from the #DFZ (Which is "The Internet", as seen by all the core routers that ACTUALLY control the internet).

However, as a precursor at about 3am there was a hint that things weren't perfect, as there was a flurry of changes from Optus to the outside world saying, roughly, 'Something has changed inside my network, but you can still keep sending me stuff'.

Now, as two final bits of possibly relevant information, the default for maximum-prefix on #Cisco #ASR9000 is 1048576 (this number is 'the number of routes that can be accepted by this router'), and MOST IMPORTANTLY the DFZ ("the internet") has about 980,000 routes in it at the moment. That's only 90k odd routes LESS than the default maximum.

I'd be amazed if Optus has less than 100k internal routes that aren't visible to the internet, but are visible internally.

So here's what I think happened. The at 3am, the first core #router was upgraded, and a new config was put in place. This did not join the network correctly, and things were half broken. What SHOULD have happened is that all the changes should have stopped, and either rolled back, or waited for further investigation (the cause being that more than 1mil routes were visible, causing it to shut down)

However, someone decided 'Well, maybe if we upgrade the SECOND one, that'll fix the first one' at 4am. That broke the SECOND one, and took Optus completely off the internet.

(Continued, see next for why this is far worse than it should have been)

Meine Lokalzeitung #DFZ ("Die Floridsdorfer Zeitung") veröffentlichte in der Oktoberausgabe ein #Interview mit mir. Vielen Dank an Chefredakteur Hannes Neumayer für das nette Gespräch!

#Floridsdorf ist der 21. Wiener Gemeindebezirk und mit über 180.000 Einwohnern alles andere als ein "Dorf" - und außerdem meine Heimat 🥰

https://www.dfz21.at/dfz/prophetischer-k-i-roman/

#Buchtipp #ScienceFiction #SciFi #SF #KI #AI #Roman

Currently #reading : By a Silver Thread by Rachel Aaron, because if anything can break me out of my reading slump it's the first book in a new #DFZ series... Even if I haven't fully accepted that the first DFZ series is actually over.
#bookstodon
https://rachelaaron.net/series.php?SID=11

#DFZ #RachelAaron OMG! a new DFZ novel out of the blue. Here's a link to preorder it:

https://www.amazon.com/Silver-Thread-DFZ-Changeling-Book-ebook/dp/B0BYB6MX9F?crid=G45KWN1V1AMN&keywords=by+a+silver+thread+rachel+aaron&qid=1678806223&sprefix=by+a+silver+thread+rachel+aaron,aps,120&sr=8-1&linkCode=sl1&tag=racaarbacoffa-20&linkId=9e2e99483491162705395bdfd6c3e578&language=en_US&ref_=as_li_ss_tl

I created a bot to answer #BGP queries over the #fediverse. What for? Well, mostly for the fun, but also because I need from time to time to find out the origin AS for an IP address or prefix, and I don't have a direct access to a #DFZ router. This article is to document this project.

https://www.bortzmeyer.org/fediverse-bot-bgp.html

Le sachiez-tu ? Les deux préfixes les plus généraux dans la #DFZ #IPv6 (la table de routage de l'Internet) sont deux /19, un à Orange, l'autre à Deutsche Telekom. #BGP

Le sachiez-tu ? (J'espère que non car c'est complètement inutile.) Le préfixe #IPv6 le plus élevé (lexicographiquement parlant) dans la #DFZ (table de routage de l'Internet) est 2c0f:fff0::/32.