[Re: http://tools.ietf.org/search/draft-hain-ipv6-ulac-01]

Mark Smith nanog at 85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org
Sun Apr 25 17:53:17 CDT 2010


On Sun, 25 Apr 2010 16:17:21 +0100
Tony Hoyle <tony at hoyle.me.uk> wrote:

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> On 25/04/2010 03:01, Mark Smith wrote:
> > I'm a typical, fairly near future residential customer. I have a NAS
> > that I have movies stored on. My ISP delegates an IPv6 prefix to me with
> > a preferred lifetime of 60 minutes, and a valid lifetime of 90 minutes
> 
> What ISP would put a 'lifetime' on your ipv6 prefix?

Because they loan it to you while you are their customer. Unless you
get PI, you don't 'own' your addresses, so you can't take them with
you when you change ISPs. In IPv4 a lifetime is implicit, which might be
as long/short as while your current connection is up, in IPv6 it is
explicit.

(other people who've responded have provided other valid reasons, so I
won't repeat them)

>  That seems insane
> to me... they should give you a /48 and be done with it.  Even the free
> tunnel brokers do that.
> 

No they don't. They set a lifetime too, and if you change tunnel
broker, you don't get to keep using the same addresses.

> But then I never understood dynamic ipv4 either....
> 
> Tony
> 
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