[c-nsp] Multihoming

[Walter Keen]

  Not many options for you I'm afraid.  Some people filter out routes 
smaller than a /24.  Even if you had a /24 from ISP1, you would then 
have to get their permission to have ISP2 advertise it.  Most aren't 
willing to do this.

Is a micro (/24) allocation from ARIN (if in the US) a possibility?  If 
so, you could then run BGP to multiple providers and make this a very 
simple configuration.  If not, you'll likely have to rely on 
application-layer redundancy.  You can prioritize MX records if you are 
hosting your mail on-site through ISP1's ip addressing (what you stated 
seemed a bit unclear), and you could probably do some round-robin DNS 
entries for web hosting, but it won't be perfect.

On 09/15/2010 02:00 AM, Rocker Feller wrote:
> Hi,
>
> I am pretty new to this concept and would appreciate any guidance on how as
> a customer I can achieve redundacy with autofailover between 2 ISPs.
>
> Can I achieve this when I have a /29 from ISP1 and do not have my own PI
> ips?
>
> All my services dns, email, wan are hosted by the ISP1.
>
> Any assistance on this will be appreciated.
>
> Rocker
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