Anycast provider for SMTP?

[jlewis at lewis.org (Jon Lewis)]

On Tue, 16 Jun 2015, Owen DeLong wrote:

>
>> On Jun 16, 2015, at 12:49 , Masataka Ohta <mohta at necom830.hpcl.titech.ac.jp> wrote:
>>
>> William Herrin wrote:
>>
>>> If you read what Joe wrote, he doesn't currently have an AS number or
>>> employ BGP with his Internet providers. Extrapolate for his IPv4
>>> assignment situation and the /24 announcement barrier. In an
>>> IPv4-depleted world, he won't be doing anycast any time soon, even if
>>> it was a sound plan.
>>
>> Anyone having /24 can start hosting business with 255*N anycast servers.
>>
>> 							Masataka Ohta
>
>
> I don??t think that??s quite true?? I think you will find that 254*N is 
> probably the best theoretical Max with just a /24 and that more likely, 
> you??ll need some hosts on that subnet that don??t necessarily provide 
> anycast services bringing the practical limit somewhat lower. Of course, 
> if you have what you need to do 255, you can probably actually do 256.

Advertise the /24, internally route 256 /32s to the devices that service 
those IPs on one or more networks numbered out of other IP ranges.  The 
machines all need unique unicast IPs anyway.

----------------------------------------------------------------------
  Jon Lewis, MCP :)           |  I route
                              |  therefore you are
_________ http://www.lewis.org/~jlewis/pgp for PGP public key_________