nanog mailing list archives
Re: any dangers of filtering every /24 on full internet table to preserve FIB space ?
From: Andrey Kostin <ankost () podolsk ru>
Date: Fri, 14 Oct 2022 08:47:24 -0400
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
Current thread:
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ?, (continued)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? William Herrin (Oct 11)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Richard Golodner (Oct 11)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Matthew Petach (Oct 11)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? William Herrin (Oct 11)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Matthew Petach (Oct 16)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? William Herrin (Oct 16)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Owen DeLong via NANOG (Oct 16)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Andrey Kostin (Oct 12)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? William Herrin (Oct 12)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? David Conrad (Oct 12)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Andrey Kostin (Oct 14)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Jon Lewis (Oct 12)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Joe Provo (Oct 15)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Raymond Burkholder (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Mike Hammett (Oct 10)
- Re: any dangers of filtering every /24 on full internet table to preserve FIB space ? Jay R. Ashworth (Oct 10)