Is it time to abandon bogon prefix filters?

Wed Aug 6 13:18:57 UTC 2008

Yes.  1918 (10/8, 172.16/12, 192.168/16), D, E, reflective (outgoing
mirroring), and as always individual discretion.

--Patrick Darden

-----Original Message-----
From: Leo Bicknell [mailto:bicknell at ufp.org]
Sent: Wednesday, August 06, 2008 9:10 AM
To: nanog at nanog.org
Subject: Is it time to abandon bogon prefix filters?

"Bogon" filters made a lot of sense when most of the Internet was
bogons.  Back when 5% of the IP space was allocated blocking the
other 95% was an extremely useful endevour.  However, by the same
logic as we get to 80-90% used, blocking the 20-10% unused is
reaching diminishing returns; and at the same time the rate in which
new blocks are allocated continues to increase causing more and
more frequent updates.

Have bogon filters outlived their use?  Is it time to recommend people
go to a simpler bogon filter (e.g. no 1918, Class D, Class E) that
doesn't need to be updated as frequently?

-- 
       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/