15 Jan
2004
15 Jan
'04
9:29 p.m.
Frank Louwers writes:
On Tue, Jan 13, 2004 at 04:12:13PM -0500, Patrick W. Gilmore wrote: Filtering on a /20 or whatever (up to /24) is a bad thing because RIPE (and maybe APNIC) actually gives out /24 PI space, that comes out of RIPE's /8's, not your upstream's /20 or /16 or /whatever...
Yes, but those PIs are allocated from specific sub-ranges that are documented. So you can still filter MOST of the space by allocation boundaries, and accept /24 only in the "PI" ranges. We do this. This is RIPE-specific (we aggregate most non-RIPE routes under 0.0.0.0/0), but other RIRs may have similar policies, although probably with easier-to-find PI swamp ranges. -- Simon.