Re: IPv6 prefixes longer then /64: are they possible in DOCSIS networks?

[Owen DeLong <owen () delong com>]

On Nov 28, 2011, at 7:29 AM, Ray Soucy wrote:

> It's a good practice to reserve a 64-bit prefix for each network.
> That's a good general rule.  For point to point or link networks you
> can use something as small as a 126-bit prefix (we do).

Technically, absent buggy {firm,soft}ware, you can use a /127. There's no
actual benefit to doing anything longer than a /64 unless you have
buggy *ware (ping pong attacks only work against buggy *ware),
and there can be some advantages to choosing addresses other than
::1 and ::2 in some cases. If you're letting outside packets target your
point-to-point links, you have bigger problems than neighbor table
attacks. If not, then the neighbor table attack is a bit of a red-herring.

Owen