IPv6 Default Allocation - What size allocation are you giving out

Thu Oct 9 04:40:07 UTC 2014

In message <482678376.131852.1412829159356.JavaMail.zimbra at snappytelecom.net>, 
Faisal Imtiaz writes:
> > A /60, /56, /52 or /48 allows the client to run multiple SLAAC
> > subnets (16, 256, 4096 or 65536) and to have the reverse ip6.arpa
> > zone delegated on a nibble boundary. 
> 
> Understood...
> 
> > There is plenty of address space even handing out /48's to everyone.
> 
> Also Understood.
> 
> >Only short sighted ISP's hand out /56's to residential customers.
> 
> I am curious as to why you say it is short sighted? what is the technical or 
> otherwise any other reasoning for such statement ?  

256 is *not* a big number of subnets.  By restricting the number
of subnets residences get you restrict what developers will design
for.  Subnets don't need to be scares resource.  ISP's that default to
/56 are making them a scares resource.

Mark

> Faisal Imtiaz
> Snappy Internet & Telecom
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org