IPv6 Confusion

Randy Bush randy at psg.com
Fri Feb 20 05:49:50 UTC 2009

> Do you really want to keep state for hundreds of end user devices in
> your equipment?
> In my mind, IPv6 more than ever requires the customer to have their
> own L3 device (which you delegate a /56 to with DHCPv6-PD).
> Imagine the size of your TCAM needed with antispoofing ACLs and
> adjacancies when the customer has 100 active IPv6 addresses (remember
> that IPv6 enabled devices often have multiple IPv6 addresses, my
> windows machine regularily grabs 3 for instance).

we do not have to imagine.  c & j have both demonstrated the nat scaling
problem when protyping for comcast.  that is why the idea of a 'carrier
grade' nat in the core has become man near-edge nats and ds-lite.  it is
sorely broken architecture.


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