A Technical Look at Iran's Internet Shutdowns

Re:A Technical Look at Iran's Internet Shutdowns by bawolff on Sunday July 13, 2025 @06:16PM (#44554271)

> IPv4 addresses are limited and constantly reallocated. Most are rented and passed between hosting providers, resold between datacenters, or migrated across regions. The Iranian filtering system uses GeoIP databases and BGP information to decide which IP ranges to trust and which to block. But those records lag behind the changes.

This is surprising to me. Surely iranian ISPs would have directly allocated IP space?

Or alternatively, surely Iran's gov would be in the routers and be able to blackhole any routes leaving the country?

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Re:A Technical Look at Iran's Internet Shutdowns by immibis on Sunday July 13, 2025 @06:41PM (#44554453)

Are they sanctioned away from RIPE? Russia is. Russia isn't allowed to be allocated any IP addresses they don't already have. They're Russia, so they already have a bunch, but if they didn't, they'd have to keep borrowing them on grey markets, possibly different ones each time.

(Fun fact about sanctions: the International Criminal Court is sanctioned away from Microsoft, so they can't legally get access to Windows or Office. This is because they prosecuted a war criminal the USA likes.)

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Re:A Technical Look at Iran's Internet Shutdowns by raron on Sunday July 13, 2025 @09:28PM (#44555547)

> Fun fact about sanctions: the International Criminal Court is sanctioned away from Microsoft, so they can't legally get access to Windows or Office.

How does that even work? There are many companies in the EU that (legally) sells second hand Windows and Office licenses to anyone.

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Re:A Technical Look at Iran's Internet Shutdowns by CaptainFever on Monday July 14, 2025 @12:22AM (#44556432)

I'm ignorant about this, but I'm surprised there isn't just some physical switch that just straight up airgaps all network routes going out of the country.

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Re:A Technical Look at Iran's Internet Shutdowns by psnehanshu on Monday July 14, 2025 @03:50AM (#44557455)

There is, so that's why you need to use Starlink as the exit. A Starlink terminal connects directly to a stattelite bypassing all local infrastructure. Unless Iran confiscates those terminals or shoots down those satellites, they can't block it.

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Re:A Technical Look at Iran's Internet Shutdowns by znano on Monday July 14, 2025 @04:03AM (#44557526)

Yes also typical disturbance noises seem to not work on these satellites otherwise they would've done it. probably due to them being LEO satellites. because they have stronger signals and that makes it harder for noise/jammers to overpower legitimate signals (higher signal-to-noise ratio).

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Re:A Technical Look at Iran's Internet Shutdowns by bawolff on Monday July 14, 2025 @08:18AM (#44559293)

That seems inconsistent with what the article is claiming.

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