[181113] in North American Network Operators' Group
Re: Anycast provider for SMTP?
daemon@ATHENA.MIT.EDU (Jon Lewis)
Tue Jun 16 17:07:04 2015
X-Original-To: nanog@nanog.org
Date: Tue, 16 Jun 2015 17:06:52 -0400 (EDT)
From: Jon Lewis <jlewis@lewis.org>
To: Owen DeLong <owen@delong.com>
In-Reply-To: <18C0FD70-FAF4-4305-8CBB-295AD46385C5@delong.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
On Tue, 16 Jun 2015, Owen DeLong wrote:
>
>> On Jun 16, 2015, at 12:49 , Masataka Ohta <mohta@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
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