Using IPv6 with prefixes shorter than a /64 on a LAN

Douglas Otis dotis at
Mon Jan 24 17:42:28 CST 2011

On 1/24/11 11:04 AM, bmanning at wrote:
>   well... you are correct - he did say shorter.  me - i'd hollar for my good
> friends Fred and Radia (helped w/ the old vitalink mess) on the best way to
> manage an arp storm and/or cam table of  a /64 of MAC addresses. :)  It was
> hard enough to manage a "lan"/single broadcast domain that was global in scope
> and had 300,000 devices on it.
> "route when you can, bridge when you must"

It seems efforts related to IP address specific policies are likely 
doomed by the sheer size of the address space, and to be pedantic, ARP 
has been replaced with multicast neighbor discovery which dramatically 
reduces the overall traffic involved.  Secondly, doesn't Secure Neighbor 
Discovery implemented at layer 2 fully mitigate these issues?  I too 
would be interested in hearing from Radia and Fred.


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