Subnetting Practices

[Sander Steffann]

Hi Seth,

> I'm working on a subnetting scheme for my IPv6 deployment and I'm curious 
> to what the current best practices regarding IPv6 subnets are. For 
> example, if I need a point-to-point link, something I'd normally assign a 
> /30 in v4, I see /64 being used as the v6 equivalent. This seems kind of 
> wasteful to me, so if anyone out there can clarify why, I'd appreciate it.

Because every IPv6 network has it's link-local addresses, you might not even 
need to assign a subnet to the link. For example, OSPF for IPv6 works fine 
with only link-local addresses on the links between the OSPF routers.

- Sander