[cisco-nas] Multihoming Question

[Paul Stewart]

Thanks very much... the other ISP in the equation and ourselves are
directly peered which would help....

I guess my one question is whether or not the customer needs their own
unique ASN if both ISP's are advertising from their ASN's that
particular IP block...?  It would just appear to the outside world that
both ISP's can route that space right?  Just a thought.... we'd send the
other ISP a LOA to send to their upstreams etc....

We had a downstream that had their own /24 portable space and their own
ASN... I talked to ARIN and they said this must be an old customer
before policy changes.  Not sure how they managed to get this space as
it was just last year when they applied and got approval.... that would
be ideal if our customers could just buy a /24 and an ASN really....

Thanks again,

Paul
 

-----Original Message-----
From: Adam Greene [mailto:maillist at webjogger.net] 
Sent: Wednesday, December 13, 2006 9:28 AM
To: Paul Stewart; cisco-nas at puck.nether.net
Subject: Re: [cisco-nas] Multihoming Question

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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