On Tue, Jun 5, 2012 at 4:29 PM, Owen DeLong <owen@delong.com> wrote:
On Jun 5, 2012, at 3:15 PM, Chris Grundemann wrote:
On Jun 5, 2012, at 2:23 PM, William Herrin wrote:
2. Subnetting in v6 in a nutshell:
FWIW - There is a published BCOP on IPv6 subnetting: http://www.ipbcop.org/ratified-bcops/bcop-ipv6-subnetting/
Unfortunately, this BCOP recommends /56s for residential which is potentially harmful.
While it does use /56 as an example (mainly because most of the operators I have spoken to say that is as big as they'll go and many are shooting for less) but it does NOT make that a recommendation, from the BCOP: "This is an example for demonstrative purposes only. Individual operators will need to determine their own prefix size preference for serving customers (internal or external). The SMEs of this BCOP highly recommend a /48 for any site that requires more than one subnet and that a site be defined as an individual customer in residential networks."
I'm also not a fan of the /126 or /127 on point-to-points, but, the theoretical issues of neighbor table exhaustion attacks, etc. certainly should not be ignored entirely.
Agreed, they must be considered. Cheers, ~Chris
Owen
-- @ChrisGrundemann http://chrisgrundemann.com