[31565] in North American Network Operators' Group
Address delegations & filters
daemon@ATHENA.MIT.EDU (bmanning@vacation.karoshi.com)
Thu Sep 28 17:50:34 2000
From: bmanning@vacation.karoshi.com
Message-Id: <200009282155.VAA08469@vacation.karoshi.com>
To: nanog@merit.edu
Date: Thu, 28 Sep 2000 21:55:22 +0000 (UCT)
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Poking about, getting ready for the next in-addr audit, I came across the
following bit of information that may have an effect on those ISPs who
filter based on RIR delegation policy.
If I remember correctly, a common tactic is to filter the traditional
/16 space to ensure that nothing greater than a /16 in announced. For
those folks who do this, there are implications for the following prefixes:
165.0.0.0/16
166.0.0.0/16
167.0.0.0/16
169.0.0.0/16
All of these /16s have portions of the /16 subdelegated as /24s and
apparently have been this way for some period of time, e.g. pre ARIN.
FWIW.
--bill
