RE: Operational Renumbering Procedure

[Pekka Savola <pekkas@xxxxxxxxxx>]

On Mon, 28 Apr 2003, Fred Baker wrote:
> At 05:25 PM 4/28/2003 +0300, Pekka Savola wrote:
> >Are you saying you would rather drive your customer
> >away than punching a hole in some other ISP's aggregate by announcing a
> >few (IPv4) /24's to the DFZ?
> 
> There is routing and there is ingress filtering. If you don't choose to 
> route the traffic *to* the other ISP's prefix, that's fine with me. The 
> other ISP can do that just fine.
> 
> We're discussing ingress filtering, and you're telling me that you will 
> arbitrarily tell your customer that he may either use your service or be 
> multihomed, but not both. 

No, that's not the point.  The point is saying "use a mechanism that 
works".  Sending packets with wrong source address is not that.

> You can say that if you want, but if the CIO of 
> your customer's network has decided to be multihomed, you are deciding you 
> don't need his business.

Thus, we need better multihoming mechanisms, which work without damaging 
the networks.
 
> For the price of adding a line to an access list on the ingress filter, you 
> can retain his business and continue receiving money from a multihomed 
> customer. Is this not your business objective? 

It's not as simple as that.  The changes need to be made pretty much
everywhere, but even that could be manageable.  What do you do when your
multihomed customer complains that it can't reach a lot of networks when
the traffic goes by you? (as other folks are doing ingress filtering from
your direction)

Of course, you can sell a service with no guarantees and strong
disclaimers "this is probably not going to work", but IMO it's better to
say "this really won't work properly, you'd be better off using a working
multihoming technique".

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings



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