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Re: do bogon filters still help?

  • From: william(at)elan.net
  • Date: Wed Jan 11 16:48:53 2006


On Wed, 11 Jan 2006, Florian Weimer wrote:

You should move 192.88.99.0/24 from SPECIAL to YES (although you
shouldn't see source addresses from that prefix, no matter what the
folks at bit.nl think).  169.254.0.0/16 should be NO (otherwise it
wouldn't be link-local).
I think you just explained it yourself why this is "SPECIAL", i.e.
routing of it depends on local policies and setup. Anything where it
is not clear from RFCs if it should be routable or not and where it
depends on local decisions & policy is what I called SPECIAL.
Uhm, no.  6to4 anycast only works without hickups when the prefix is
NOT treated in any special way. 8-) That's part of its charm.  If
operators start to install special filters, they break this
functionality for no real gain.
I think this is still quite a bit of a special case as opposed to for
example 24/8 block which is ultimately used same as regular RIR blocks.
Nevertheless I changed routing to "YES" and leave explanation for future.

I also did update and listed comment for reserved blocks with explanation
that either regularly updated filters should be used or blocks should be
left fully routable.

--
William Leibzon
Elan Networks
william@elan.net