nanog mailing list archives
Re: any dangers of filtering every /24 on full internet table to preserve FIB space ?
From: William Herrin <bill () herrin us>
Date: Wed, 12 Oct 2022 08:25:39 -0700
On Wed, Oct 12, 2022 at 7:54 AM Andrey Kostin <ankost () podolsk ru> wrote:
IMO this line wasn't arbitrary, it was (and it still is) a smallest possible network size allocated by RIRs. So it's just a common sense to receive everything down to /24 to have the complete data about all Internet participants.
Hi Andrey, Filtering routes longer than /24 route filtering came first and is the cause here while the RIR minimum assignment is an effect. The RIRs stay at /24 because it would be implicitly wasteful to assign addresses in units smaller than can be routed on the public Internet. Of the things that would have to change to make longer prefixes routeable on the Internet, the RIR policies are the easiest. The /24 boundary is simply a holdover from pre-CIDR times when the smallest routing unit was a "class C." Folks wanted to make sure CIDR didn't make their routing woes worse, so they filtered and it stuck. Regards, Bill Herrin -- For hire. https://bill.herrin.us/resume/
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 ? 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 ? 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)