December 2007 - NANOG - lists.nanog.org

BGP community attribute taxonomy
by Benoit Donnet 04 Dec '07

04 Dec '07

Dear Nanog community, During the past years, we have seen an increasing usage of the BGP community attribute. For instance, in a recent BGP table dump from routeviews, 99% of the routes stored by the router carries BGP communities. In this context, we are currently working on a BGP community taxonomy, i.e., we want to classify and document communities according to their usage. We describe our taxonomy on the following url: http://inl.info.ucl.ac.be/communities Based on this taxonomy, we tried to collect as much as possible information on BGP communities. This was a daunting task as we mainly relied on public database, such as whois server and ISP web sites. Our current database of classified BGP communities currently contains more than 12,000 entries. When running our database and taxonomy on recent BGP table dumps from RouteViews and RIPE (last dump from September 2007), we were only able to classify, on average, 20% of the encountered communities. Based on this result, we ranked the unclassified BGP communities. Here is the top 10 of most seen ASes using uncommented communities: AS19151 AS3549 AS3549 AS2914 AS7473 AS286 AS3292 AS13237 AS6667 AS34225 You can find the top 100 on the following url: http:// www.info.ucl.ac.be/~donnet/communities.html It gives the AS number as well as, for each AS, the various unclassified communities and their total frequency (i.e., the number of times the AS with unrecognized communities is encountered in table dumps). If you have any documentation regarding these communities, it would be very helpful if you can send us back this information. The easiest way for you is probably to reply to this email and attach the information (text, PDF, doc file, ...). When our database will be enough representative of the used BGP communities, we will made it freely available. We will also propose a way for updating (adding or removing) BGP communities information in our database. Thanks in advance. Best regards. Dr. Benoit Donnet & Prof. Olivier Bonaventure -- Dr. Benoit Donnet Université Catholique de Louvain (UCL) Faculté des Sciences Appliquées - Département d'Ingénierie Informatique (INGI) Place Sainte Barbe, 2 1348 Louvain-la-Neuve Belgium Phone: +32 10 47 87 18 Home page: http://inl.info.ucl.ac.be/donnet

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Book on Network Architecture and Design
by MARLON BORBA 03 Dec '07

03 Dec '07

Fellow NANOGers, I am in search of a good book about Network Architecture and Design, with emphasis in Quality of Service and convergent networks, to be used as a reference. Could you please indcate your favorites? -- Abraços, Marlon Borba, CISSP, APC DataCenter Associate Técnico Judiciário - Segurança da Informação IPv6 Evangelist TRF 3 Região (11) 3012-1000 r. 5678 -- Practically no IT system is risk free. (NIST Special Publication 800-30) -- IPv6: só 96 bits a mais (Comitê Gestor da Internet Brasil) --

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Cogent issues in Chicago?
by Brandon Galbraith 03 Dec '07

03 Dec '07

Is anyone else experiencing routing issues with their Cogent connectivity in the Chicago area? Their NOC is aware of it, but was unable to provide any ETR.

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Re: Re: Giga fiber Tap
by ChiYoung Joung 03 Dec '07

03 Dec '07

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Giga fiber Tap
by 정치영 03 Dec '07

03 Dec '07

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Re: Giga fiber Tap
by David Newman 01 Dec '07

01 Dec '07

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > Netoptics work great. Check out their aggregation taps. Some 4-port fiber gig taps, including Netoptics ones, drop frames when aggregate utilization exceeds 1 Gbit/s. That can be 500 east + 501 west or 1001 west, or 251 in each of 4 ports or whatever. I'd heard about a kiddie porn case getting tossed because the defense successfully argued law enforcement's tap may have dropped frames. I didn't believe it until I measured this myself with a packet blaster. I used VSS taps in my tests. Brian Chee of the University of Hawaii tried this before me with a Netoptics tap, with similar results: Endicott-Popovsky, B.E., Chee, B. and Frincke, D. Role of Calibration as Part of Establishing Foundation for Expert Testimony, in Proceedings 3rd Annual IFIP WG 11.9 Conference January 29-31, 2007, Orlando, FL. dn -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) iD8DBQFHULwTyPxGVjntI4IRAjaZAJ0eoGVzaxXh+TIuyx8tmfOlupj+LACfcFmI jUq2/DFjHiyrJRekjTnxnic= =s8IF -----END PGP SIGNATURE-----

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Comcast.net Email Admin
by Stasiniewicz, Adam 01 Dec '07

01 Dec '07

Can a Comcast.net email admin please contact me? One of your non-outermost email servers is running an SPF/SenderID filter (so all messages from domains with -all SPF/SenderID records are getting rejected, regardless of sending server). Thanks, Adam Stasiniewicz

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