On Mon, 10 Sep 2007, Stephen Sprunk wrote:
Sucks to be them. If they do not have enough PA space to meet the RIR minima, the community has decided they're not "worthy" of a slot in the DFZ by denying them PI space.
Not true, there is an ARIN policy that allows you to get a /24 from one of your providers even if you only need 1 IP address:
If the PA /24 is under 199/8 or 204-207/8, then the filters being discussed would allow their advertisement through, because ARIN's minimum allocation for those blocks is /24. In ARIN's 22 other /8s, the filters would not because the minimum is /20 (or /22, for 208/8).
As long as enough NSPs don't filter on RIR minimums, there's still a pretty good chance that when a small PA multihomer's IP space provider's connection is down, traffic routed towards that provider will get rerouted to their other provider(s). Breaking PA /24 multihoming would be unfortunate collateral damage. Perhaps someone could use the data from the cidr-report and RIRs to create a precision targeted prefix-list intended just to block unnecessary more specifics rather than across the board on RIR minimums? You could even do two different versions. A loose version that just throws out covered subnets with same as-path and a BOFH version that throws out all apparently gratuitous subnetting smaller than RIR minimums, but not all smaller than RIR minimum routes. I just wonder how huge the list would be and what the CPU and config size damage would be. ---------------------------------------------------------------------- Jon Lewis | I route Senior Network Engineer | therefore you are Atlantic Net | _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________