From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Sat May 29 2004 - 14:49:30 GMT-3
At 7:24 AM -0700 5/29/04, Tom Rogers wrote:
>Howard,
>We were thinking of multihoming. I have few questions to ask U.
>1)Do we have to justify for desiring an AS , IIRC from ARIN ?
Yes, but multihoming to two or more ISPs is generally adequate. Do
note that they typically won't give you the ASN until you can show
them contracts for the connections, often to be installed within a
month.
>2)Where do we get the independent network #s?
I'm not sure I understand. You can multihome perfectly well with
provider-assigned address space, as long as both providers agree to
advertise address space from one provider's address space. Both
providers _must_ advertise your /24 or equivalent as well as their
less-specifics.
>3)Will my 2 diiferent ISPs route my class c network? (I was reading
>in the group somewhere that only /19 re routable..
Nothing is ever certain, but there's an increasing tendency to let
multihomed /24 through. Realistically, you must coordinate with both
ISPs when multihoming. One of the things that makes it more likely
for your address space is that both ISPs include it in their
publically accessible routing policy in one of the public routing
registries.
>
>Thanx in advance
>Tom
>
>"Howard C. Berkowitz" <hcb@gettcomm.com> wrote:
>
>At 9:44 PM -0400 5/28/04, Peter van Oene wrote:
>>At 04:20 PM 5/28/2004, MMoniz wrote:
>>>Also in the real world, most ISP's will offer to advertise either customer
>>>only or all routes.
>>>I would assume they accomplish this with an AS-path filter to you! Much
>>>simpler!!
>>
>>usually communities if they are clueful.
>
>Peter, did you just use "clueful ISP practice" in the same thought as
>"CCIE lab"?
>
>>
>>>Just as you can filter the same with an AS-path filter from your ISP.
>>
>>agree
>>
>>>We have this exact scenario where we are multihomed with our own AS and
>>>accept full routes. In fact if
>>>you are multihomed I think you must have your own AS, or an agreement
>>>between your different ISP's.
>
>It's really not that difficult to get an AS -- $500 per year, IIRC
>from ARIN and probably about the same from the other routing
>registries. RIPE-NCC requires and ARIN recommends that you register
>your routing policy in their routing registry database -- and if you
>don't know how to do that, you really shouldn't be running BGP in the
>Internet. A competent consultant can set up a reasonable multihoming
>policy and do your application in under a day. Get a consultant and
>watch closely -- make training a part of the contract.
>
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