[c-nsp] Multicast on PPP

[Gert Doering]

Hi,

On Mon, Oct 26, 2009 at 12:37:49PM -1000, Antonio Querubin wrote:
> >(But *if* you connect end users using PPP, you don't need an IGMP proxy
> >on the ISP side - either the end user is directly connecting his machine
> >to the PPP link, in which case it's "direct IGMP, no proxy", or the
> 
> I think that really depends on the type of equipment connecting the end 
> user. Our access servers here aren't cisco equipment, do not run PIM, but 
> do act like layer 3 devices.  Hence the only way for the access server to 
> communicate group membership between the network and the end-user is to 
> track the IGMP membership on all the PPP links and then proxy that on its 
> ethernet interface.  On the other hand, for end-users who are sourcing 
> multicast traffic, because our access servers do not run PIM, the sourced 
> multicast traffic is just punted directly onto the ethernet.

Yes, you're certainly right here.  In case of a dial-in server that does
not speak PIM, using an IGMP proxy in the dial-in server will certainly
enable end users (direct IGMP speakers, no PIM-using CPE) to receive
multicast streams.

Thanks for pointing out this bit.

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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