[ppml] NANOG IPv4 Exhaustion BoF

John Curran jcurran at istaff.org
Fri Mar 7 11:47:47 EST 2008

At 8:37 AM -0800 3/7/08, David Conrad wrote:
>Ignoring the fact that the vast majority of customers will not be bringing their own blocks (they will instead be connecting via a (perhaps multi-layered) NAT and thus  not contribute to the routing load), there will be back pressure on "transfers" of such long prefixes simply because they won't get you where you need to go.

If the customers servers requiring unique addresses are
covered by some PA assigned space, that's true.  When ISP's
can't find more address space to use for this purpose, then
you'll see customer-provided blocks being routed instead or
customers being turned down for IPv4 services, which will
lead them to an ISP which will accept & try to route them...

The ISP's who try not to pollute end up having to reject the
new customer, and then again not accept their route when
another ISP takes up the same customer.  The ISP who
takes the customer and tries to route them to the peers
gets the revenue and simply redirects any connectivity
blame to the well-behaved ISP for 'needlessly' filtering.
(This, btw, is mirrors the dialog that went down during
some of the earlier peering/filtering ISP wars...)


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