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Re: [RRG] Long term clean-slate only for the RRG?
Bill,
On Jun 28, 2008, at 9:25 AM, William Herrin wrote:
a) PI for everyone
If I understand your meaning here, I'd describe this as "BGP PI for
Everyone => Randy Bush's $10M routers."
Yep.
b) NAT
I disagree with characterizing NAT as an alternative. NAT's likely
contribution to the routing problem is already represented in the
status quo. Unless you're aware of a clever new way to use NAT to
relieve routing pressure that isn't an obvious non-starter?
The idea I've heard repeated is along the lines of the following
scenario:
a) IPv4 address space becomes more expensive as the free pool exhausts
b) People with IPv4 space realize they can use NAT, renumber to
private space, and sell off their IPv4 holdings. This results in all
an ISPs customers only needing a single PA address each. The ISP can
also offer a hosting service in which multiple customers share a
single IP address in a virtual host web/smtp/whatever farm (each
service being an additional cost, of course).
c) ISPs buy up the freed up IPv4 address space and use it to assign
single public addresses to their customers. Given the use of NAT,
renumbering impact is limited to the ISP, thus it is feasible that
ISPs can trade address blocks with each other in order to obtain
larger contiguous blocks and reduce announcements.
In the end of this scenario, you have something that looks a bit like
a final-state loc/id split albeit asymmetric instead of map-encap
symmetric. Scaling concerns are greatly reduced (although not
eliminated as 4 billion doesn't go as far as it used to). Multi-
homing (of a sort) is implemented by having multiple addresses from
different providers on the CPE NAT box and playing stupid DNS games
(e.g., short TTLs and dropping A RRs when connectivity failure is
detected).
Am I missing an alternative?
1. Status Quo.
I might argue that this isn't stable in the long term due to the way
RIR policies are defined. We've already seen a tendency towards PI-
for-everyone at all of the RIRs. I expect this to get better rather
than worse over time. However, I agree that it is an alternative,
albeit perhaps only in the short-term.
2. New IP layer-4 protocols and change everything up to layer 7.
Agreed, although I'd hope that a new IP would implement some form of
loc/id split.
Regards,
-drc
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