v6 subnet size for DSL & leased line customers

Mark Smith nanog at 85d5b20a518b8f6864949bd940457dc124746ddc.nosense.org
Sun Dec 23 23:05:48 UTC 2007

On Sun, 23 Dec 2007 19:46:26 +0100
Florian Weimer <fw at deneb.enyo.de> wrote:

> * Joe Greco:
> >> Right now, we might say "wow, 256 subnets for a single end-user... 
> >> hogwash!" and in years to come, "wow, only 256 subnets... what were we 
> >> thinking!?"
> >
> > Well, what's the likelihood of the "only 256 subnets" problem?
> There's a tendency to move away from (simulated) shared media networks.
> "One host per subnet" might become the norm.

Or possibly maybe Peter M. Gleitz's and Steven M. Bellovin's idea of

"Transient Addressing for Related Processes: Improved Firewalling by Using IPV6 and Multiple Addresses per Host"


A /64 per host is probably not necessary, however if an end-site has
a /48, that's 65K hosts so it wouldn't likely be much of a problem for
most sites ... certainly not my house currently or in the forseeable
future or my current employer, or most employers I've worked for in the


        "Sheep are slow and tasty, and therefore must remain constantly
                                   - Bruce Schneier, "Beyond Fear"

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