Re: Origin ASN seen vs Origin ASN in Whois Records Report?

From: Stephen Sprunk (no email)
Date: Sun Nov 23 2008 - 21:17:32 EST

  • Next message: Joe Abley: "Re: Origin ASN seen vs Origin ASN in Whois Records Report?"

    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




  • Next message: Joe Abley: "Re: Origin ASN seen vs Origin ASN in Whois Records Report?"





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