[address-policy-wg] Re: IPv6 addresses really are scarce after all

Arnt Gulbrandsen wrote:
> Hallam-Baker, Phillip writes:
> 
>> I don't see how such an architectural limitation can be enforced. 
>> There is no way that the IETF can prevent an ISP issuing IPv6 
>> customers a /128 if they choose.
> 
> 
> Not directly, but there's the indirect route: a) IETF designs IPv6 
> autoconfiguration. b) Linksys, D-Link, Netgear and friends make boxes 
> that support autoconfiguration. c) ISP hand out /128s. d) 
> Autoconfiguration doesn't work well. e) Customers call ISP support. f) 
> ISP loses $$$. g) ISP starts issuing /48s instead.
> 
> I don't know the first thing about how IPv6 autoconfiguration works. It 
> worked very well in my previous office. Will it work better when the 
> router has a /48 at hand than a /64 or /128?
> 
> Arnt
> 
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I remember working with my own little  lan:

three Site Local and one tunnel networks.

radvd or SuSE 7.1 and SuSE 8.2 did expect /64

The tunnel would either give me a /64 without local router
or a /48 if I had a local router.


Today Site Local is given up. So I changed to 192.168...
addresses with 6to4 addressing.


RFC 2462 says we normally have EUI-64 addressing that is
either a funtion of the MAC address or a random number.
With EUI-64 (64 bits) the prefix must be /64 for an
autoconfigured network segment.


The tunnel used to be a /124 network segment
overlapping my /64 with ..0 the net, ..1 the other
end of the tunnel, ..2 me and ..3 broadcast.

Theoretically ..2 would have been a router for anything
in my /64, but that never worked. So practically I
ended up with a /128


If you have a LAN with servers you need predictable
addresses for your servers. Renumbering is not an
option. Site Local does not exist any longer. 182.168..
with 6to4 addressing is the only way I see. But
that means - no autoconfiguration.

Without autoconfiguration /124 and NAT is good enough
for me. But how about my aunt with her laptop?


Kind regards
Peter and Karin


-- 
Peter and Karin Dambier
Cesidian Root - Radice Cesidiana
Rimbacher Strasse 16
D-69509 Moerlenbach-Bonsweiher
+49(6209)795-816 (Telekom)
+49(6252)750-308 (VoIP: sipgate.de)
mail: peter at peter-dambier.de
mail: peter at echnaton.arl.pirates
http://iason.site.voila.fr/
https://sourceforge.net/projects/iason/
http://www.cesidianroot.com/