NANOG Digest, Vol 38, Issue 26

Yaoqing(Joey) Liu joey.liuyq at gmail.com
Mon Mar 7 21:14:41 CST 2011


>
> Message: 9
> Date: Mon, 7 Mar 2011 11:32:39 -0600
> From: "Yaoqing(Joey) Liu" <joey.liuyq at gmail.com>
> Subject: About the different causes of multiple origin ASN(MOAS)
>        problem
> To: nanog at nanog.org
> Message-ID:
>        <AANLkTi=RpzYDhcroH2043uiA7XDa0Apo2cHhu6y6XC6V at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> Hi,
>
> I'm trying to find all causes of multiple origin AS problem(MOAS) as
> follows, but not sure if it's complete. Also please let me know how popular
> each item is, especially item 3 and 4 that I'm very curious about.
>
> 1. Internet Exchange Points, we have observed a list of this prefixes,
> although they generally are not announced to the DFZ.
> 2. Anycast, rare, but occurs sometimes, for example, 192.88.99.0/24,
> 2002::/16, and 2001::/32
> 3. Multi-homing with Private AS number
> 4. Multi-homing using static route (customer doesn't have AS number)
> 5. Misconfiguration
> 6. Hijacking
> 7. What else?
>
> Thanks,
> Yaoqing
>
>
> ------------------------------
>
> Message: 10
> Date: Tue, 8 Mar 2011 01:02:19 +0000
> From: "Dobbins, Roland" <rdobbins at arbor.net>
> Subject: Re: About the different causes of multiple origin ASN(MOAS)
>        problem
> To: nanog group <nanog at nanog.org>
> Message-ID: <6A23D7CB-9DA4-48DF-B655-B1397C573BF6 at arbor.net>
> Content-Type: text/plain; charset="us-ascii"
>
>
> On Mar 8, 2011, at 1:32 AM, Yaoqing(Joey) Liu wrote:
>
> > I'm trying to find all causes of multiple origin AS problem(MOAS) as
> > follows, but not sure if it's complete.
>
> 1.      MOAS isn't necessarily a 'problem'; it's fairly common, these days,
> and has been for quite some time.  The actual problem is the inability to
> determine when it's intentional and not evil, vs. unintentional or
> intentional and evil.
>

Good point. That's why I need to have a complete cause list first, then I
can try to tell the evil from the good.

>
> 2.      There's already a fair body of work on this topic, as a Web search
> for "multiple origin as" reveals.  Check the NANOG archives for Lixia's
> preso, among others.
>

I know a lot of previous work about MOAS, but they were not comprehensive
enough to drill down to the prefix level and also the results have been
outdated. We need to know what things were going on recently.

Yaoqing

>
> -----------------------------------------------------------------------
> Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>
>
>                The basis of optimism is sheer terror.
>
>                          -- Oscar Wilde
>
>
>
>
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> End of NANOG Digest, Vol 38, Issue 26
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