Please Check Filters - BOGON Filtering IP Space

James Laszko james at
Fri Jan 21 07:04:03 UTC 2005

Well, if the router CAN run BGP, the feed from Cymru is only about 84
prefixes - not a lot of memory tied up there, is there?

If the router isn't capable of BGP, someone earlier today was kind
enough to post a script that they use to find changes to one of the
BOGON lists and suggested an Expect script to automatically update their
router.  Probably a little advanced for most leaf sites, but for someone
who's responsible for a larger network -- doesn't seem that bad.

James Laszko
Pipeline Communications, Inc.
james at

-----Original Message-----
From: Hank Nussbacher [mailto:hank at] 
Sent: Thursday, January 20, 2005 10:51 PM
To: James Laszko
Cc: nanog at
Subject: RE: Please Check Filters - BOGON Filtering IP Space

On Thu, 20 Jan 2005, James Laszko wrote:

> sort of mechanism.  If they're not going to use something like the
> BOGON BGP feed they should build their own and should have configured
> their managed routers to query that from the beginning.  As more

How would this scale for say 200K routers?  2M?  -Hank

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