North American Network Operators Group

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Re: Route table growth and hardware to the filter

  • From: Stephen Sprunk
  • Date: Mon Sep 10 18:29:08 2007

Thus spake "Kevin Loch" <[email protected]>
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:


"This policy allows a downstream customer's multihoming
requirement to serve as justification for a /24 reassignment from
their upstream ISP, regardless of host requirements."

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).

Let's also keep in mind that if other folks block a PA more-specific, the site doesn't lose connectivity unless they lose their upstream connection to the LIR that assigned them the block. I suspect that many of them already see that behavior today, at least partially; we're really discussing making it a near-complete outage versus a semi-outage. That's life if you don't qualify for a real routing slot via PI.


Stephen Sprunk "God does not play dice." --Albert Einstein
CCIE #3723 "God is an inveterate gambler, and He throws the
K5SSS dice at every possible opportunity." --Stephen Hawking