nanog mailing list archives

Re: fuzzy subnet aggregation


From: Christopher Morrow <morrowc.lists () gmail com>
Date: Sun, 27 Oct 2019 17:33:07 -0400

On Sun, Oct 27, 2019 at 3:09 PM Joe Maimon <jmaimon () jmaimon com> wrote:

Does anyone have or seen any such tool? I have a script that seems to
work, but its terribly slow.

Currently I can produce aggregated subnets that can be mising up to a
specified number of individual addresses. Which can be fed back in for
multiple passes.


your aim is to get to maximum aggregation .. with some overage, like
90% of a /24  ?
so missing like 25 addresses in a whole /24.. (for instance)

Doing RTBH on individual /32 does not scale well, if you are eyeing
collaboration with external lists. I have found likely sources that could
produce another 100k prefixes easily.

Joe


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