DOCSIS 3.0 and Multicast

Scott Helms khelms at
Fri Nov 29 19:38:34 UTC 2013


Arbitrarily turning uni-cast traffic into multi-cast won't do much in that
regard.  If the end points that didn't orginally ask for the data NAK the
incoming stream then they'll get kicked out of the IGMP group, further the
requesting end point will be confused by the fact that the traffic is
coming in as multi-cast.  You could put up some fake hosts that will take
any multi-cast data, but they'd be pretty easy to spot over time and making
all of your home gateways accept multi-cast traffic they didn't ask for
would be a bad thing (think trivial DDoS of your system).

Scott Helms
Vice President of Technology
(678) 507-5000

On Fri, Nov 29, 2013 at 1:47 PM, Phil Karn <karn at> wrote:

> On 11/29/2013 10:03 AM, Frank Bulk wrote:
> > It looks like Cisco is doing something in the IP Video over DOCSIS area,
> and
> > so if you're serious about this, you could reach out to them.
> It's not video over IP multicast that interests me so much as the
> opportunity to thwart NSA-style bulk traffic analysis by multicasting
> unicast messages with encrypted destination addresses so an eavesdropper
> can't tell who it's for.

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