nanog mailing list archives
Re: Is it time to abandon bogon prefix filters?
From: "Patrick W. Gilmore" <patrick () ianai net>
Date: Thu, 7 Aug 2008 14:52:43 -0400
On Aug 7, 2008, at 2:04 PM, Pete Templin wrote:
Patrick W. Gilmore wrote:Filter your bogons. But do it in an automated fashion, from a trusted source. Of course, I recommend Team Cymru, which has a most sterling record. Nearly perfect (other than the fact they still recommend MD5 on BGP sessions :).How can you recommend Team Cymru, when their product is not in any way a filter? It is merely an automated method of injecting aggregate null routes for bogons, but in no way prevents a network from accepting aggregate or specific bogon announcements (i.e. it does not _filter_).
HUH?Team Cymru offers many ways to set up filters, null routes, etc. See <http://www.team-cymru.org/Services/Bogons/ >.
Oh, and to answer Randy's question about how much actually comes from bogons, on that same page:
<quote>How much does it help to filter the bogons? In one study conducted by Rob Thomas of a frequently attacked site, fully 60% of the naughty packets were obvious bogons (e.g. 127.1.2.3, 0.5.4.3, etc.). A presentation based on that study, entitled "60 Days of Basic Naughtiness," can be viewed here. Your mileage may vary, and you may opt to filter more conservatively or more liberally. As always, you must KNOW YOUR NETWORK to understand the effects of such filtering.
</quote> I guess that means filtering bogons is useful. -- TTFN, patrick
Current thread:
- RE: Is it time to abandon bogon prefix filters?, (continued)
- RE: Is it time to abandon bogon prefix filters? Sean Donelan (Aug 26)
- Re: Is it time to abandon bogon prefix filters? Kevin Loch (Aug 19)
- Re: Is it time to abandon bogon prefix filters? Pekka Savola (Aug 19)
- Re: Is it time to abandon bogon prefix filters? Kevin Loch (Aug 20)
- Re: Is it time to abandon bogon prefix filters? Jo Rhett (Aug 21)
- Re: Is it time to abandon bogon prefix filters? Sean Donelan (Aug 21)
- Re: Is it time to abandon bogon prefix filters? Jared Mauch (Aug 25)
- Re: Is it time to abandon bogon prefix filters? Marshall Eubanks (Aug 25)
- Re: Is it time to abandon bogon prefix filters? Mark Andrews (Aug 25)
- Re: Is it time to abandon bogon prefix filters? Pete Templin (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Patrick W. Gilmore (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Robert E. Seastrom (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Randy Bush (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Robert E. Seastrom (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Patrick W. Gilmore (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Rob Thomas (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Rob Thomas (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Randy Bush (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Niels Bakker (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Rob Thomas (Aug 07)
- Re: Is it time to abandon bogon prefix filters? Rob Thomas (Aug 07)