David Conrad писал(а) 2022-10-12 11:39:
Andrey,
There was a period in the mid- to late-90s where some of RIRs allocated longer than /24s, i.e., to match the amount of address space justified by the requester, even if that meant (say) a /29. This didn’t last very long as one of the (at the time) 800 lb gorillas (Sprint) decided to start filtering at /19 (which IIRC was the default prefix length RIPE-NCC chose to allocate to LIRs) to keep their routers from falling over.
I'm looking at it only from a practical side. I worked for different ISPs in RIPE region in 2000-s and never saw anything like that. There was a requirement from RIPE to create an object for any assigned /29 subnet and larger for IP space usage documentation, but from allocated block. Anyways, even is it's true, it doesn't change anything. There are /24 PI blocks and if /24s are filtered, default route must be in use to have functional Internet connectivity. Thanks, Andrey