Hmm, Last night (Euro time) there was a huge flood of BGP updates into the internet, looking deeper it appears that CERNET3 went down and up for a moment. This would normally be a non issue, the BGP table sees a steady stream of updates per second of people mostly doing the same thing (your average full routing table has about 10 changes per second). Except CERNET3 is a bit weird. It has 4096 IPv6 /32's, and ASNs... CERNET3 calls this "slicing", and I've never really figured out what benifit this gives them to export 4096 prefixes, let alone 4096 ASNs. Anyway, whatever happened hit all of the "slices". Causing a huge flood of updates to flood around the internet. Not necessarily fatal (though this did cause a noticeable CPU spike, the only reason I noticed it), it does feel like poor behavior here to design a network where this impact is this visible from the outside!
hisold@toot.io
replied 15 Apr 2025 16:06 +0000
in reply to: https://benjojo.co.uk/u/benjojo/h/yjKxXbCzgGVftSM45n
@benjojo I know someone that creates a sub project just to put 4 classes in. Then another sub project... These are the sort of people who would definitely have a ASN for each prefix.
wolf480pl@mstdn.io
replied 15 Apr 2025 16:24 +0000
in reply to: https://benjojo.co.uk/u/benjojo/h/yjKxXbCzgGVftSM45n
this stuff? > The FITI backbone core nodes are located in 31 Chinese provincial-level regions [...] it supports 4,096 large-scale trial networks, achieving interconnection with domestic and international IPv4/IPv6 trial facilities, according to Xinhua. https://www.globaltimes.cn/page/202104/1221584.shtml it sounds like some kind of testbed for testing how 4096 networks interact with each other... but then why'd they connect that to the internet?
jeroen@secluded.ch
replied 15 Apr 2025 19:38 +0000
in reply to: https://benjojo.co.uk/u/benjojo/h/yjKxXbCzgGVftSM45n
@benjojo That is the FITI thing aka "CERNET3" -- https://www.cernet.net/fiti_backbone_network/index.html At least the good thing is that CERNET does not have open telnet with simple user/pass anymore on all their routers, took a while to get them that message through ;) The thing is, 4096 "slices"/ASNs is not even that bad considering they are serving all the universities in China with that, at 1.4B folks with 1/3rd in school age, makes sense
the chinese edition https://www.insc.tsinghua.edu.cn/sypt/FITI.htm shows 1.2T links though.