Re: IPv4 Anycast?

[Nathan Ward <nanog () daork net>]

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