[113845] in North American Network Operators' Group
Re: IPv4 Anycast?
daemon@ATHENA.MIT.EDU (Zhenkai Zhu)
Wed Apr 22 03:12:52 2009
Date: Wed, 22 Apr 2009 00:12:06 -0700
From: Zhenkai Zhu <zhenkai@ucla.edu>
To: Nathan Ward <nanog@daork.net>
In-Reply-To: <3601C6D1-764C-4A68-B018-374BF2250ACF@daork.net>
Cc: nanog list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Ah, that's very possible. So I suppose the 90 prefixes with 3 origin
ASes are due to the same reason..
Then there is basically no inter-As anycast besides the anycast prefix
for DNS root, since I only noticed like 8 prefixes that are announced by
more than 3 ASes..
----
--Zhenkai
Nathan Ward wrote:
> On 22/04/2009, at 6:53 PM, Zhenkai Zhu wrote:
>
>> Hello NANOG,
>>
>> I noticed that more than 3K prefixes are with 2 Origin ASes.
>> Are they the simplest cases of anycast? Or they are mainly due to
>> misconfiguration?
>
>
> The third (and probably more likely) option is that the prefixes are
> advertised by two providers as the customer wants redundancy with
> their own IP space, but does not have a public ASN. Ie. the customer
> has a circuit and possibly a BGP feed to two different providers.
>
> --
> Nathan Ward
>
>
>
