Re: [magma] multicast senders behind an IGMP Proxy

In IPv6, the scoping can be accomplished simply with the existing scope
bits without having to rely on the Hop Count.

The home router simply acts as a scope border and does not forward
traffic to the Internet.

Regards,
Brian


Prashant Jhingran wrote:
> Hi,
> 
> I would like to suggest following methods to  resolve this
> issue:
> 
> - TTL scoping can be used to control the distribution of
> multicast traffic with the objective of easing stress on
> scarce resources viz. bandwidth.
> 
> - Another way (and probably a preferred choice) would be to
> use administratively scoped IP multicast [rfc2365]. 
> 
> Moreover, these methods can (to a certain extent) help in
> achieving privacy.
> 
> PS: "sending audio to all of your IP-enabled speakers
> distributed throughout your house" seems to be very
> ambitious usage of multicast :-) 
> 
> Regards,
> Prashant Jhingran
> 
> Huawei Technologies
> +91-80-41117676 Ext -7175
> +91-9448927814
> 
> "Sing, dance, serve, meditate and celebrate" 
>  - www.artofliving.org  
> 
> -----Original Message-----
> From: Dan Wing [mailto:[email protected]] 
> Sent: Friday, June 22, 2007 5:48 AM
> To: [email protected]; [email protected]
> Cc: Toerless Eckert
> Subject: [magma] multicast senders behind an IGMP Proxy
> 
> During WGLC, there was clear consensus from MAGMA and MBONED
> that supporting
> multicast senders behind the IGMP Proxy device was
> desirable.  However,
> while wrapping up draft-ietf-behave-multicast-07, Toerless
> pointed out a
> problem with multicast senders behind an IGMP Proxy device
> (any IGMP Proxy
> device -- not just an IGMP Proxy in a NAT).
> 
> The problem is that any multicast flows generated behind the
> IGMP proxy will
> be forwarded up the access link towards the Internet -- even
> for flows that
> you want to keep within your network.  Concrete examples of
> generating
> multicast within a home network include:
> 
>  * sending audio to all of your IP-enabled speakers
> distributed 
>    throughout your house,  
>  * IP-enabled intercom system, 
>  * HD video to multiple telvision sets (kitchen and living
> room).
> 
> In each case, you "could" do unicast, but especially for HD
> one might easily
> envision not having sufficient bandwidth or not wanting to
> waste the
> bandwidth (which might be used for other things).
> 
> Does anyone have suggestions on how this might be resolved?
> 
> -d
> 
> 
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