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Re: Please Check Filters - BOGON Filtering IP Space

  • From: Joe Maimon
  • Date: Thu Jan 20 11:20:53 2005

David Barak wrote:

--- Suresh Ramasubramanian <>

David Barak <> wrote:

While it says that bogon filters change, and


a URL to check it, what percentage of folks who


use a feature like "autosecure" would ever update
their filters?

What do they do to update that bogon list anyway -
push a new IOS image?

That's a mighty fine question: the link I referenced
is the most recent I was able to find, and its list of
bogons is thoroughly out-of-date. In the interest of
long-term reachability, I would call on Cisco to
remove the IANA-UNASSIGNED blocks from the autosecure

I think the last time this was hashed out here, there was a consensus that Cisco should not be promoting a feature that uses a static list for blackholing. The problem is with now-good-bogons bad enough as it is, even with a presumably competent admin responsible for the setup.

Perhaps Cisco could couple this with a scheduled scp to a server of choice, preferably Cisco's, for an update checking feature. At that point I would think perhaps it has a bit more + than - to it.

At any rate it should NOT be tied to IOS images, the vast majority of those never get upgraded. Make ACLS be able to parse their rules from a file stored wherever. Just like that new DHCP static bindings from text file feature.


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