[cisco-nas] Multihoming Question

[Adam Greene]

Paul,

My experience from being on the customer end of this arrangement is that it 
should work whether you assign the customer a /24 from your own netblock or 
have them buy a /22 direct from ARIN. In either case the customer would need 
a unique ASN from ARIN.

If I remember correctly, the only requirement your customer would have in 
order to be entitled to buy a /22 from ARIN is that they be multihomed. I 
believe the cost is on the order of $1500/yr. If they don't want to pay so 
much, getting the IP space from you would be a savings; plus, it would add 
to the stickiness of your relationship with the customer (to leave you, they 
would have to renumber their network, which is often a hurdle -- and the 
reason we chose to get IP space direct from ARIN a few years ago).

I'm not aware of a way to make this work utilizing a private ASN, unless you 
and the other ISP have some kind of peering relationship.

My 2 cents, hope it helps




----- Original Message ----- 
From: "Paul Stewart" <pstewart at nexicomgroup.net>
To: <cisco-nas at puck.nether.net>
Sent: Tuesday, December 12, 2006 10:19 AM
Subject: [cisco-nas] Multihoming Question


> Hi there...
>
> We have some customers who are seeking connections from us (ISP) and
> another ISP for redudancy.  This will be offered as a managed package
> deal to the customer.
>
> Because this will involve BGP from both ISP's, the end customer would
> require an AS number and their own IP space.  The problem comes into
> place with the customer's size and the fact that they will most likely
> not require even a full /24 block in most situations and really their
> own AS number is probably a wasted resource.
>
> Is there a common practice in place today for these types of customers?
> What I was wondering is if we allocate a /24 on our side and allow the
> other ISP to advertise that particular /24 then there is now two paths
> to the customer for that /24 space (even though the end customers would
> be each getting probably just a /29 after we split up the block).  Then
> both ISP's involved could run eBGP to the customer via a private AS
> number?
>
> I'm looking for some kind of solution and figure this must be done in
> various ways today...? :)
>
> thanks,
>
> Paul
>
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