[109448] in North American Network Operators' Group
Re: Origin ASN seen vs Origin ASN in Whois Records Report?
daemon@ATHENA.MIT.EDU (Stephen Sprunk)
Sun Nov 23 21:18:13 2008
Date: Sun, 23 Nov 2008 20:17:32 -0600
From: Stephen Sprunk <stephen@sprunk.org>
To: Joe Abley <jabley@hopcount.ca>
In-Reply-To: <004D0474-1D21-4D63-BE49-D48369C02AC7@hopcount.ca>
Cc: nanog <nanog@nanog.org>, info@BGPmon.net
Errors-To: nanog-bounces@nanog.org
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Joe Abley wrote:
> On 19 Nov 2008, at 19:16, Heather Schiller wrote:
>> ARIN makes available a list of prefixes with OriginAS. I don't know
>> if other RIR's do.
>
> How is that list generated?
>
> I'm not aware of any tight coupling between address assignment and AS
> assignment that binds anybody to advertise particular routes with
> particular origins, at least at the time that either is
> assigned/allocated by an RIR/LIR.
>
Presumably it's from the "Origin AS" field in WHOIS:
http://www.arin.net/registration/templates/netmod.txt
Template: ARIN-NET-MOD-4.1
** As of February 2007
** Detailed instructions are located below the template.
01. Registration Action (M or R):
02. IP Address and Prefix or Range:
03. Network Name:
04. Origin AS:
...
04. List all AS numbers from which the network may originate.
You can list as many AS numbers as necessary. You must
separate multiple AS numbers with a comma. You may not list
AS number ranges; only list individual AS numbers.
Interesting is how accurate the field actually is. Slide 6 at:
http://www.arin.net/meetings/minutes/ARIN_XXII/PDF/friday/engineering_report.pdf
says that 91% of the routes they checked had a correct Origin AS in
WHOIS, compared to 64% in the ARIN IRR database.
S
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