[6bone] Is minimum allocation /64 now?

[Tim Chown]

On Sat, Oct 25, 2003 at 04:56:09PM +0100, Jørgen Hovland wrote:
> 
> Not trying to start a huge discussion, but:
> DHCP does the same thing with a smaller prefix, and also gives you the
> correct dns-settings and/or bootp-options ++. Since you obviously think you
> can get 2^64 devices on a single lan, dhcp can reject new devices an ip
> address if there are none availible.

I'm not sure I understand the point here?
(And at the moment, DHCPv6 is still needed for DNS resolver discovery even
for statelessly autoconfiguring hosts)

I agree you can do what you like inside your own network - but for interop
outside you should use the standards, love them or not :)
 
> IPv6 is 128 bits and IPv4 32.
> If we used an "ipv4-stylish" allocation plan for ipv6, and dropped the extra
> bits we saved by not wasting excessive space, how much money would your
> company save ?
> 
> Lets say we save 64 bits:
> Thats 8 bytes per packet.
> 256000 pps gives 2048kb per second ~ 20mbit = 800-5000++??? month

You would then be more open to port scanning attacks that otherwise are
far less feasible in IPv6?   It's nice to use a random 64-bit host address
for some addition warm fuzzy feeling ;)

Tim