Message: 9 Date: Mon, 7 Mar 2011 11:32:39 -0600 From: "Yaoqing(Joey) Liu" <joey.liuyq@gmail.com> Subject: About the different causes of multiple origin ASN(MOAS) problem To: nanog@nanog.org Message-ID: <AANLkTi=RpzYDhcroH2043uiA7XDa0Apo2cHhu6y6XC6V@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
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Message: 10 Date: Tue, 8 Mar 2011 01:02:19 +0000 From: "Dobbins, Roland" <rdobbins@arbor.net> Subject: Re: About the different causes of multiple origin ASN(MOAS) problem To: nanog group <nanog@nanog.org> Message-ID: <6A23D7CB-9DA4-48DF-B655-B1397C573BF6@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about MOAS, but they were not comprehensive enough to drill down to the prefix level and also the results have been outdated.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@arbor.net> // <http://www.arbornetworks.com>
The basis of optimism is sheer terror.
-- Oscar Wilde
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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.
there is no complete cause list you can not know evil from good because you have no way of knowing intent haven't you ucla people figured this out yet? randy
On Mon, Mar 7, 2011 at 9:17 PM, Randy Bush <randy@psg.com> wrote:
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.
there is no complete cause list
I admit it's basically impossible to get a complete list, but at least, I want to have a try to make it as complete as possible in order to understand the issue. I think industry people should have more experience to give me the answer, since all the data come from the real practice. For example, how popular private AS number used for multi-homing, and how popular one organization has no AS number using static routing. Yaoqing
you can not know evil from good because you have no way of knowing intent
haven't you ucla people figured this out yet?
randy
participants (2)
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Yaoqing(Joey) Liu