Is it time to abandon bogon prefix filters?

Laurence F. Sheldon, Jr. LarrySheldon at
Fri Aug 15 10:31:44 CDT 2008

Randy Bush wrote:

> in the field != untouched/unloved
> i contend that all one's routers should be rigorously configured as
> programmatically as possible.

It seems to me that those are the routers where the filtering of both 
packets and routes is easiest and most effective.  If every such router 
(which almost be definition knows what source addresses and routes are 
legitimate) filtered out all the crap, there would not be much crap 
getting to the DFZ.

Too hard.  I don't think so.  When I administered a /16 with "only" a 
hundred or so such routers, a simple skeleton config-file-base allowed 
quick construction of a config file at installation--which was then 
rarely touched ever again.  (We did log at a central location and used 
SNMP monitors for supervison.)

Requiescas in pace o email              Two identifying characteristics
                                              of System Administrators:
Ex turpi causa non oritur actio        Infallibility, and the ability to
                                              learn from their mistakes.
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