[arin-ppml] Rationale for /22

Chris Grundemann cgrundemann at gmail.com
Mon Aug 3 19:10:52 EDT 2009

On Mon, Aug 3, 2009 at 15:08, <michael.dillon at bt.com> wrote:
> > Thinking a little out side the box here and I'm not even sure
> > something like this would be legal, it might be considered
> > colluding.  What if a pair of providers or maybe even a set
> > of providers were to jointly obtain a block of addresses to
> > allow customers to multihome.  Customers would connect to two
> > or more participating providers, announce there block to the
> > providers and then the providers contain the customer
> > announcements within there joint infrastructure and only
> > announce the aggeraget to the Internet.
> No need to "jointly obtain" addresses. The two ISPs just need
> to agree to use a block from one of their allocations and to
> maintain direct peering links with sufficient bandwidth to
> handle the failover traffic.
> When I was with Ebone back in 2000 we arranged this for a major
> customer who wanted to have a backup ISP but did not want to
> be responsible for managing multihoming. From the business
> point of view they wanted ONE provider and that was Ebone. But
> they wanted Ebone to buy and managed multihomed connectivity
> to another major ISP. Since Ebone was supposed to be fully managing
> the solution, we couldn't register a PI block in their name, but
> had to use a chunk of our own space and get another ISP to announce
> that chunk as well.

We see something along these lines fairly regularly - A managed
services provider of some sort who peers with multiple ISPs sells
their customer a redundant connection which they manage. i.e. their
AS, their IP space, their routers - just two handoffs to the customer
(or maybe one, I don't typically see that side).  Multihoming by proxy
I guess you would call it.  Thing is, we usually see these guys
advertise long prefixes (often /24s) to get some load-balancing of the
upstream circuits I expect.

More to the point of these threads (i hope); is that right now,
obtaining address space is not the roadblock for those who can justify
that space and want to multihome.  I do not think that ARIN assigning
/24s to multihomers (who can justify the need) will cause any
explosion in the demand for multihomed /24s - a drop in the price of
BGP speaking routers and/or a growth of BGP cluefull engineers is
probably more worrisome...


> --Michael Dillon
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Chris Grundemann

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