IPv4 Anycast?

Wed Apr 22 07:12:06 UTC 2009

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
>
>
>