Help with DHCPv6 client-identifiers

Ted Lemon Ted.Lemon at nominum.com
Sat Nov 19 20:58:49 UTC 2011


On Nov 20, 2011, at 5:03 AM, "Alex Bligh" <alex at alex.org.uk> wrote:
> Most switches do not reliably deliver packets to both NICs if the same MAC
> is presented on multiple ports.

I'm sure that's true.

> Are you really suggesting there is no requirement for uniqueness of
> hardware addresses in a broadcast domain, but that there is a requirement
> for IPv6 subnets to be /64 or shorter?

No, there is a requirement for link-layer addresses to be unique across a broadcast domain in some technologies, including ethernet.   It's just that this requirement sometimes goes unsatisfied.   Strictly speaking, IPv6 prefixes that are actually used for communication between hosts should be exactly 64 bits, no more and no less.   If you have a /48, you're expected to allocate a bunch of /64s out of it, not leave it flat.




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